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[Q] Paradox with underclock & battery savings, does it actually hurt? SetCPU, etc.

[Q] Paradox with underclock & battery savings, does it actually hurt? SetCPU, etc.
In theory, using SetCPU or other underclocking app to reduce CPU clock should reduce the power draw from the CPU, therefore reducing battery consumption.
However, underclocking does not reduce the amount of work that needs to be done. That is to say, whatever app or kernel processing that needs to be done will still be done. When UC'ed, they will be done at a slower pace, therefore taking longer time. In some cases, the UI becomes sluggish, requiring more user interaction time as well.
If, at 1Ghz, a process takes 10 seconds to complete and requires 10mA per second. This task should consume 100mA. By underclocking to 500mHz, perhaps the CPU takes only 6mA, but the task will require 20 seconds to complete. Now the task actually takes 120mA (plus the longer screen on time).
Is my theory sound?
Also, does the constant scaling itself consume power?
As far as I know, Froyo is supposed to scale the CPU anyway. So why underclock? Does it actually work or does it hurt the battery life?
Input please!
Thanks.
Edit: I know the function of CPU speed vs. efficiency vs. battery drain is never linear, and each situation has a different break-even point, but I'm curious the general application of underclocking within the Android environement and its effect on battery life, and more specifically, the Evo.

i'm a regular dude with a phone, but im educated...that being said im sure your aware of the diminishing marginal utitlity law. For example if me and you can mow a lawn in 2 hours, and we got one more guy, we can do it in in less than two...Bu you eventually reach a breakoff point where it is hurting you and those extra guy(s) are not needed and acutally slow down the process or are just a waste. Same thing here, although i am not sure of the numbers, im positive there is a sweet spot for underclock and if you go too low it actually is a waste or hurts battery life. It also could be in the middle meaning, im going to make up numbers. 1ghz uses 100 Mah in 10 seconds. 800 mhz used 50 mah. 900 uses 60 mah. Now, the difference ratio of battery usuage and spees would lean you towards using 900 because if you relate this to sales on products or even anything, for lack of better words this setting is the best abng for your buck...my 2 cents

http://www.google.com/m/url?client=...IQFjAA&usg=AFQjCNFlNlZCm-gnvD1PzEsDezCIPeA8jQ
Sent from my PC36100 using Tapatalk

Interesting stuff... Take a look at this thread:
[ROOT] Using SetCPU + Perflock Disabler to Save Battery, Underclock
The data seem to suggest that underclocking an Evo at idle yields real results. I would think that this can only work if there is not a lot of background/idle tasks going on?

snovvman said:
Interesting stuff... Take a look at this thread:
[ROOT] Using SetCPU + Perflock Disabler to Save Battery, Underclock
The data seem to suggest that underclocking an Evo at idle yields real results. I would think that this can only work if there is not a lot of background/idle tasks going on?
Click to expand...
Click to collapse
both pics depicts very different device usages. not a fair comparison imo.

quocamole said:
both pics depicts very different device usages. not a fair comparison imo.
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Click to collapse
Yea I went through and read the whole thread. I'm now even less convinced that SetCPU provides any tangible battery benefits at all.

snovvman said:
Yea I went through and read the whole thread. I'm now even less convinced that SetCPU provides any tangible battery benefits at all.
Click to expand...
Click to collapse
Do you think i am right on any part of which i said or am i talking out of my arse lol

A microprocessor does not live by its clock alone. lol
It can cycle through a huge math operation, which is loaded into its registers lickity split with a fast clock. It will have to wait while the memory/code of the programs it runs are loaded either into its cache memory or into execution space. So in calculating theoretical energy use, you got to figure the bus speed, as well as the type of operations the processor is doing.
Golly, ( pronounced like a resident of Mayberry) the bus is key on loading programs to be run. What's the bus clock triggered off? That's the key. You don't want the bus to slow while slowing the cpu. If you can cycle the processor while it prefetches then you've got optimal use, providing it isn't thrashing.
Google cpu wait states for bus synchronization

This is basically the reason HAVS is supposed to be better than static scaling and underclocking. With HAVS, voltage is based on workload as well as clock speed, so you should get the benefits of running fast/idling more often combined with the benefits of using as low of a voltage as possible. As long as you don't have something pegging the CPU at 100% all the time in the background, it should, in theory, work better.
In practice, I haven't seen all that much of a difference.

iitreatedii said:
i'm a regular dude with a phone, but im educated...that being said im sure your aware of the diminishing marginal utitlity law. For example if me and you can mow a lawn in 2 hours, and we got one more guy, we can do it in in less than two...Bu you eventually reach a breakoff point where it is hurting you and those extra guy(s) are not needed and acutally slow down the process or are just a waste. Same thing here, although i am not sure of the numbers, im positive there is a sweet spot for underclock and if you go too low it actually is a waste or hurts battery life. It also could be in the middle meaning, im going to make up numbers. 1ghz uses 100 Mah in 10 seconds. 800 mhz used 50 mah. 900 uses 60 mah. Now, the difference ratio of battery usuage and spees would lean you towards using 900 because if you relate this to sales on products or even anything, for lack of better words this setting is the best abng for your buck...my 2 cents
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Click to collapse
iitreatedii said:
Do you think i am right on any part of which i said or am i talking out of my arse lol
Click to expand...
Click to collapse
What you wrote makes sense and the concept is sound. I just wish we knew what that sweet spot is, although I think it changes constantly based on load, code, and operational requirements.
With the two posts above, it would seem like phone manufactures would do everything they can to optimize efficiency. Having SetCPU loaded for 24 hours, I too, can say that I have not seen a huge difference...

Noxious Ninja said:
This is basically the reason HAVS is supposed to be better than static scaling and underclocking. With HAVS, voltage is based on workload as well as clock speed, so you should get the benefits of running fast/idling more often combined with the benefits of using as low of a voltage as possible. As long as you don't have something pegging the CPU at 100% all the time in the background, it should, in theory, work better.
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Does the stock HTC kernel, 2.6.32 "#11" have/use HAVS?

better battery life

I've been using CyanogenMOD 7 and love it (mostly). The one thing I don’t like about it is the short battery life. I'm kind of new to rooting phones so it took me a bit to get it rooted and get CM7 rolling. I was wondering if there are any mods out there like CM7 that have better battery life? Or if there's any thing I can add to CM7 to give it more batter life?
I've been using android since the first phone came out so I’m already knowledgeable in what to turn off to try and extend the battery life, but I have noticed a big decrees in batter since installing CM7.
Thanks for the help guys
Trench

You can under clock the processor when your phone is asleep. This creates better battery life.
Sent from my HTC Vision using XDA App

Have you tried wiping battery stats?

evilcuber said:
You can under clock the processor when your phone is asleep. This creates better battery life.
Sent from my HTC Vision using XDA App
Click to expand...
Click to collapse
your phone automatically underclocks your processor when it sleeps (for most CPU governors), you do not need to tell it to do so.
I'm not picking on you fyi, I'm just making sure we are giving people accurate information... there's only one thing worse than no information: incorrect/incomplete information.
op: which version of CM7 are you running? remember, the more minimal your setup (ie less homescreens, less widgets, manual syncing of gmail and whatever else, etc) the better your battery life will be. this is especially true of newer phones that are getting heftier cpu & gpus that, while intelligent with power consumption, are going to drain even larger capacity batteries relatively quick with moderate/heavy usage.
how long are we talking with battery life? how heavy a user are you? for reference, I get around 16 hours of battery life if I don't charge the phone at all from unplugging to battery dying with moderate to heavy usage (texting ~50 times a day, sometimes up to 100 emails depending on what's happening at work, couple hours of calls, couple hours of streaming music [pandora or audiogalaxy], couple of hours of games [peggle and plants v zombies mostly - both of which are resource hogs], etc).
I have just learned to get used to the fact that the phone is going to die if I use it a lot, so I've purchased three micro-usb cables and a car charger.. that way, unless I'm in an area where there is no charge-capable usb port nearby, I'm always able to get a little more juice if need be.

pmcqueen said:
your phone automatically underclocks your processor when it sleeps (for most CPU governors), you do not need to tell it to do so.
I'm not picking on you fyi, I'm just making sure we are giving people accurate information... there's only one thing worse than no information: incorrect/incomplete information.
op: which version of CM7 are you running? remember, the more minimal your setup (ie less homescreens, less widgets, manual syncing of gmail and whatever else, etc) the better your battery life will be. this is especially true of newer phones that are getting heftier cpu & gpus that, while intelligent with power consumption, are going to drain even larger capacity batteries relatively quick with moderate/heavy usage.
how long are we talking with battery life? how heavy a user are you? for reference, I get around 16 hours of battery life if I don't charge the phone at all from unplugging to battery dying with moderate to heavy usage (texting ~50 times a day, sometimes up to 100 emails depending on what's happening at work, couple hours of calls, couple hours of streaming music [pandora or audiogalaxy], couple of hours of games [peggle and plants v zombies mostly - both of which are resource hogs], etc).
I have just learned to get used to the fact that the phone is going to die if I use it a lot, so I've purchased three micro-usb cables and a car charger.. that way, unless I'm in an area where there is no charge-capable usb port nearby, I'm always able to get a little more juice if need be.
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but i also mean setting the max sleep to 368mhz. by default its set at 800mhz. sometimes with apps running in the background, the processor may go to 800mhz without you knowing

check out 'powersave' and set your cpu max to 806mhz. should last you a nice long time like that. responsiveness suffers, of course.
'ondemand' and 806mhz is the best comprimise for me. still fine with HDvideo recording, streaming audio, Nav, etc
if you really want to make it last... clock down to 400mhz, turn off all the sync, set brightness and timeout to minimum, all the radios off (airplane mode), and the volume down, on vibrate.
;-)

pmcqueen said:
your phone automatically underclocks your processor when it sleeps (for most CPU governors), you do not need to tell it to do so.
I'm not picking on you fyi, I'm just making sure we are giving people accurate information... there's only one thing worse than no information: incorrect/incomplete information.
op: which version of CM7 are you running? remember, the more minimal your setup (ie less homescreens, less widgets, manual syncing of gmail and whatever else, etc) the better your battery life will be. this is especially true of newer phones that are getting heftier cpu & gpus that, while intelligent with power consumption, are going to drain even larger capacity batteries relatively quick with moderate/heavy usage.
how long are we talking with battery life? how heavy a user are you? for reference, I get around 16 hours of battery life if I don't charge the phone at all from unplugging to battery dying with moderate to heavy usage (texting ~50 times a day, sometimes up to 100 emails depending on what's happening at work, couple hours of calls, couple hours of streaming music [pandora or audiogalaxy], couple of hours of games [peggle and plants v zombies mostly - both of which are resource hogs], etc).
I have just learned to get used to the fact that the phone is going to die if I use it a lot, so I've purchased three micro-usb cables and a car charger.. that way, unless I'm in an area where there is no charge-capable usb port nearby, I'm always able to get a little more juice if need be.
Click to expand...
Click to collapse
But some govenors don't drop the sleep to the lowest profile. In fact almost all keep it above the lowest clock. Other kernels allow it and you can also use third party to set it lower. When the tweaKr script becomes universal it will be even better =)
Sent from hells ghost chili mexdroid

ohgood said:
check out 'powersave' and set your cpu max to 806mhz. should last you a nice long time like that. responsiveness suffers, of course.
'ondemand' and 806mhz is the best comprimise for me. still fine with HDvideo recording, streaming audio, Nav, etc
if you really want to make it last... clock down to 400mhz, turn off all the sync, set brightness and timeout to minimum, all the radios off (airplane mode), and the volume down, on vibrate.
;-)
Click to expand...
Click to collapse
It suffers in powersave because it stays at the lowest setting only. No reason to set to 806. Lol and that bottom comment is hella funny =), but if he does that his phone will just be...a waste of pocket space.
Your best bet is to do some research on kernels. If you are using cm7 to cm 7.0.3 id recommened pyros kernel. If you are on 7.1 or a nightly over 121 I believe id go with eugene's streamline5. It did wonders for mine Also there is a battery saving tips. Google G2 battery saving tips. Should be first link that comes up.
Cyanogenmod roms are known to be battery hungry. Nom nom nom.
Sent from hells ghost chili mexdroid

cjward23 said:
Have you tried wiping battery stats?
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Click to collapse
I used the battery califration app if that's what you mean.
Thanks for all the help guys, i'll check out some Kernals.

popimp315 said:
Your best bet is to do some research on kernels. If you are using cm7 to cm 7.0.3 id recommened pyros kernel.
Click to expand...
Click to collapse
Do you have link for this? I'm running 7.0.3.. but I dont think im finding the correct Kernal.

Mugen 3600mah = better battery life...

Can you elaborate on what kind of battery life you are getting now? How many hours, and for what level of usage?
How long have you been on CM? It takes a couple charge cycles of the battery after flash any ROM, for the battery meter to be accurate. Clear battery stats (as mentioned) then charge to 100%, let drain to about 20%, repeat a couple times. Don't drain until the phone dies. Some people say to do this, and its not good advice. Over discharge of Li ion batteries can cause them to no longer take a charge. There are people on here, on the Vision and other phones, that let their battery drain to empty, then the phone would no longer boot, forcing them to replace the battery.

Mog said:
Mugen 3600mah = better battery life...
Click to expand...
Click to collapse
It has good battery life but the battery sticks out a lot and its very uncomfortable
Sent from my HTC Vision using XDA App

evilcuber said:
It has good battery life but the battery sticks out a lot and its very uncomfortable
Sent from my HTC Vision using XDA App
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Click to collapse
Yup its all opinionated. I would never go back to stock.
Sent from my T-Mobile G2 using XDA App

trench619 said:
Do you have link for this? I'm running 7.0.3.. but I dont think im finding the correct Kernal.
Click to expand...
Click to collapse
Dev section
Sent from my HTC Vision using XDA Premium App

Average battery life for gaming?

I'm just wondering if anyone else uses their Nexus for gaming, and what kind of life they're getting.
I'm using Android Revolution with the franco kernel. I was playing Majesty (hardly an intensive game) and in 15min it accounted for 17% of what drained the battery. I need to play a game more intensely to see what's normal, but that seems like a heavy drain.
Anyone have a heavy gaming night or two with the phone and know about how long the phone will last? I'm using the extended battery, but even then I'd wager you would see 1-2 hours of gaming at best, depending on what kind of game you're playing.
Looks like I'm still waiting on a phone with awesome battery life for gaming :/. My iPhone came close, but I would never trade this phone for my iPhone when it comes to the overall experience. Any tips for getting this thing to last longer, or is it what it is?

I would imagine battery life for gaming will be approximately half the screen time you get for normal usage. I usually get 4-5 hours screen time normal usage so if played wind up Knight or similar I would expect around 2 hours time. You can stretch it out more if you take breaks and let phone and battery cool down. The hotter your battery the more juice it leaks. Playing with a fan on will help a little also. Undervolting would help some in this situation. And I would imagine a game like ssolitaire you would only lose about 10-20% of your normal usage screen time. Playing with brightness down all the way will probably be the biggest help.

3 hours max I'd imagine, most likely less.
Sent from my Galaxy Nexus using Tapatalk 2

Damn. Thanks. Looks like I'll need a tablet for planes and other travel .

Yea, I wouldn't buy an android device if you wanted to just do some heavy gaming on it.
Vita would be best for real mobile gaming
But iOS would be the best if you wanted a smartphone/tablet for gaming

I get between around 2 - 3 when fully charged and gaming non-stop. A lot of that is screen drain, so if possible turn your brightness down really low. Also it helps if you turn your CPU down to only 1GHz or so. Performance is still fine there but it helps on battery. Be sure and undervolt as much as possible too.
And dont use Franco's 512MHz GPU kernel.
Personally, I use the Glados kernel and overclock the MPU to 112%. Set the minimum speed as 392MHz, and max speed of 1GHz. Undervolt the 392 step to 925mv, and underclock the 1GHz step to 1175mv. Set the GPU to 384MHz and undervolt that as well. Also undervolt the IVA. This will give you good performance because your memory and bus are overclocked to help feed the GPU better, so you dont need a huge core speed for the same performance. Also the big undervolting will help your battery a lot. This is one of the biggest reasons I like Glados, you can adjust voltage for anything and not just the CPU.
If you want an Android gaming device, look into the Transformer Prime and dock. You should be able to get around 6-7 hours of gaming life on that.

I see... I'm surprised the screen is that much of a power suck. Thanks for the heads up though. I'm pretty sure Franco's Milestone 2 Kernel doesn't overclock the GPU anymore. I might just switch anyways since Glados seems to be the better kernel based on what you've said. I'm just worried that messing with voltages will ruin my battery or the phone.
2-3h is about what I seem to get though, so I suppose this usage is normal. I wasn't expecting a gaming device so I'm not crushed. I was just hoping to see better performance gains during gaming with my extended battery. Ah well... As you've all said, I need a tablet if I want a portable gaming device. Don't really want a 3DS or Vita. I'd prefer a platform that does more than simply gaming. Still in love with this phone. It does everything I need. Just doesn't cover the rare bouts of excessive gaming I might take part in .

Luuthian said:
I see... I'm surprised the screen is that much of a power suck. Thanks for the heads up though. I'm pretty sure Franco's Milestone 2 Kernel doesn't overclock the GPU anymore. I might just switch anyways since Glados seems to be the better kernel based on what you've said. I'm just worried that messing with voltages will ruin my battery or the phone.
2-3h is about what I seem to get though, so I suppose this usage is normal. I wasn't expecting a gaming device so I'm not crushed. I was just hoping to see better performance gains during gaming with my extended battery. Ah well... As you've all said, I need a tablet if I want a portable gaming device. Don't really want a 3DS or Vita. I'd prefer a platform that does more than simply gaming. Still in love with this phone. It does everything I need. Just doesn't cover the rare bouts of excessive gaming I might take part in .
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Click to collapse
Have you considered an external battery pack. I have a 2800mah that charges slow and is mainly backup but I think the bigger ones like 5000mah and up can charge faster thus helping playing time. But yeah the vita and 3ds have about the same time off charger so gnex is a lot more versatile. Maybe an iPhone 5 or equivalent iPod might give you playing time you want with bigger screen.
---------++++---------
iPhone. helping computer illiteracy become popular since 2007.

When you put it that way... Yeah. Kind of sad that the more modern handhelds have similar screen time to a cellphone, and they do a hell of a lot less.
Ah well. We'll see what the future brings. My hope is that more phones would adopt a RAZR MAXX mentality, but who can say.

Why Do People Complain About Battery?

I've seen so many threads here and at The Verge that I just don't understand. I've been using Android devices now for about two years and I've NEVER had a problem with battery life being worse than my iPhones. I have a 3GS and the battery on it dies after about 8-10 hours of moderate use. Meanwhile, I'm at 12 hours on my SGS3 and 50% battery. I also have quite a lot of applications running in the background. Granted, today I have been low usage, but yesterday I was on the phone for hours and I still went 12 hours before the battery icon turned yellow. I haven't HAD to recharge before 12 hours for ages, even my Atrix went longer than that. I even have a screenshot from a few days ago where I went 14 hours and only dropped to 63%.
Are people just nuts or what is going on here?

People expect to play games at max brightness for hours and still get 12 hours battery life.
In with you, I use my phone constantly through out the day, I run my business from my phone, and routinely get 14+ hours per charge no problem. I just made a few tweaks, nothing big, and I'm good to go. This phone lasts noticeably longer than all my previous iPhones 3,3g and 4. Plus it charges twice as fast as those and never over heats... all my iPhones would get so hot that I couldn't charge them in the car with out testing then in an ac vent, and that's just from half an hour to an hour of talking... sgs3, I can talk for hours with no overheating, and it charges like a boss.
Sent from my SAMSUNG-SGH-I747 using xda premium

Before I flashed Cyanogenmod on my S3, I rarely reached over 10 hours of battery use with data on.

Neither one of my galaxy phones overheated to where they shut off until one decided it was dirty and jumped in the washer(rip 1st sgs2) .
I had changed my iPhone 4 back glass to one of those metal backs. Now when its on charge it will almost burn your hand if ur holding it. And I have had it shut off while on Facebook. Battery never last very long on I phones if the brightness is up data going WiFi seeking and jbing.
sent from 1 of 4 Galaxy devices

people complain even though they jumped from a 3.5 to a 4.8 720 screen device. Faster processor etc. With hspa or LTE speeds. I mean really. lol

My battery life is great! Much better than any other phone I've owned...12 hours of use for me is nothing....I get 18+ without a problem....frequently I've gone well over 24 hours.

Chargers. That is all.
I mean don't these people go home and charge your device?
Juuuuust saying... I dunno. K. Whatever l. Bye.
Sent from my Samsung Galaxy S3 using xda premium

EddyVercetti said:
Before I flashed Cyanogenmod on my S3, I rarely reached over 10 hours of battery use with data on.
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Wow...u post in every thread ....must want to get that post count up huh
Sent from my SAMSUNG-SGH-I747 using xda premium

I think some phones came with defective batteries. I'm running juice defender and could easily make it through a 16 hour day. 3-4 hours of screen time was not uncommon. 3 months later, and I can barely get 10 hours of use and 1.5 hours of screen time. Time to get a new battery!
Sent from my Transformer Prime TF201 using xda premium

I am not sure what is going on. I don't have the best battery life I can get 10 to 12 hours moderate use. Steaming music, reading rss feeds, checking email, 2 to 3 hours screen on. I would easily last a day on my iPhone 4. I have juice defender, lowest screen setting, custom kernel with under volting. I think it has something to do with my area. Att is so congested in my area I am barely able to use data sometimes. It's better with lte but still an issue at times.
Sent from my At&t GSIII running CM10

People use their phones differently. Just saying.
If I don't turn the screen on, with LTE data, my phone dies in 9 hours (I tested it). And this doesn't mean there's a problem with it. I have around 15 different push notification apps running in the background, all of which are using data almost continuously. I don't think I can expect it to last much longer. And if I know I'm not going to be near a power source for longer than that, I simply turn off syncing to get better battery life.
To me, it looks like the LTE radio is the biggest battery hog. Let's see if the iPhone 5 can somehow get around this problem so that other manufacturers can take note

pngface said:
People use their phones differently. Just saying.
If I don't turn the screen on, with LTE data, my phone dies in 9 hours (I tested it). And this doesn't mean there's a problem with it. I have around 15 different push notification apps running in the background, all of which are using data almost continuously. I don't think I can expect it to last much longer. And if I know I'm not going to be near a power source for longer than that, I simply turn off syncing to get better battery life.
To me, it looks like the LTE radio is the biggest battery hog. Let's see if the iPhone 5 can somehow get around this problem so that other manufacturers can take note
Click to expand...
Click to collapse
I was going to mention this. I noticed a significant improvement in battery life once I used JuiceDefender to turn off data while my screen is off. 4G LTE is the main culprit of most of the complaints for battery life (in addition to brightness). That is going to be a big problem for the new iphone if they can't get the battery management for 4G correct. It has taken Samsung a couple of years to get the battery working decent with 4G. I have my doubts that Apple could top them the first year running LTE on the iphone. Who knows, maybe that will be the "new" feature they have been working on over the year, LTE power management. That's the direction Motorola has headed in their new RAZOR MAXX devices. We'll see, either way, the consumer comes out on top as we have more competition to drive down prices and receive better products each year.

Best battery life for SGS3
With AMOLED and Android u gotta take special measures to get good battery life:
- kill bloatware. NostalgiaTurboSlim script will help. Or freeze unneeded apps - like Maps and enable them only when needed.
- disable various notifications - Play Market, WiFi etc
- disable ads - root and download AdAway app - they steal your mobile traffic, battery life and make you blind!
- put dark nonLive Wallpaper
- remove any widgets you don't use. I just removed all of them.
- disable animations and transitions
- disable haptic feedback
- disable touch tones/sounds/vibrations
- try using nonAuto brightness (I gave up on that - sunlight does not allow me to change anything manually)
- disable autorotation
- use dark Opera browser user.css
- use inverted or dark themed apps and Gapps, there is dark MMS, Twitter and Facebook in my ROM
- downclock CPU to 1GHz, or enable PowerSave On.
- use modern KToonsez kernel with PegasusQ governor, it downclocks CPU during screen off
- use CPU1 disabler script if your ROM/kernel supports it
- keep chargers around you, buy them at amazon
- buy spare OEM battery - I'm against aftermarket batteries, they are all fake rated
Or just buy latest iPhone 5 and enjoy.
Remember: Android is for tinkerers! That's why we love it! :victory:

Why do people still use some sort of battery management app life JuiceDefender or the like.
GET RID OF THEM NOW !(most of you that use it are probably coming over from an Iphone so you may be new but aren't well educated in how the Android OS works)
This phone comes with its own Task Manager as well as removing unwanted apps that are running in the background that you have previously used and don't need running.
So get rid of these dumb apps that don't do anything.
-End rant.

i had great battery life, then a few weeks. ago a process called gsiff daemon startimg eating my battery.
Sent from my SAMSUNG-SGH-I747 using xda premium

I have AMAZING battery life.
I have two........
; )

I bought a 3150 man battery on eBay for 10$. With data on WiFi on . My battery took 30h to be completely drain. 5-6h of the 30h was heavy use ( game, download, watching video)
I'm on cm10 with kt747 kernel OC to 2106mhz UC to 96mhz
Ktoonservative governor
Noop scheduler
All my frequencies are under volt of at least 100mv each
Try this!
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

loki2828 said:
i had great battery life, then a few weeks. ago a process called gsiff daemon startimg eating my battery.
Sent from my SAMSUNG-SGH-I747 using xda premium
Click to expand...
Click to collapse
I believe this is the software bug that can be fixed in one of the threads around here. It deals with the Cell Standby that drains the battery.
Correct me if I'm wrong.

liltitiz said:
I bought a 3150 man battery on eBay for 10$. With data on WiFi on . My battery took 30h to be completely drain. 5-6h of the 30h was heavy use ( game, download, watching video)
I'm on cm10 with kt747 kernel OC to 2106mhz UC to 96mhz
Ktoonservative governor
Noop scheduler
All my frequencies are under volt of at least 100mv each
Try this!
Sent from my SAMSUNG-SGH-I747 using xda app-developers app
Click to expand...
Click to collapse
My under volt setting. I just dropped all of my steps by -55 MV and it looks stable
MHz/stock mv/my mv/-mv amount
96/925/785/-140
144/925/790/-135
192/925/800/-125
384/925/825/-100
486/925/845/-80
540/950/865/-85
594/950/875/-75
648/975/890/-85
702/975/895/-80
756/1025/950/-75
810/1025/955/-70
864/1050/970/-80
918/1050/980/-70
972/1075/985/-90
1026/1075/990/-85
1080/1125/1015/-110
1134/1125/1025/-100
1188/1150/1040/-110
1242/1150/1055/-95
1296/1175/1065/-110
1350/1175/1080/-95
1404/1185/1095/-90
1458/1185/1110/-75
1512/1200/1120/-80
1674/1200/1125/-75
1728/1250/1145/-105
1809/1275/1185/-90
1890/1300/1215/-85
1998/1325/1240/-85
2106-1350-1300
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

shugga101 said:
I believe this is the software bug that can be fixed in one of the threads around here. It deals with the Cell Standby that drains the battery.
Correct me if I'm wrong.
Click to expand...
Click to collapse
I was not planning to root this phone. but I rooted kt. renamed the file, and it seems to be fixed wih no problem that i can see
Sent from my SAMSUNG-SGH-I747 using xda premium

Fix Exynos 990 battery drain and Overheating Issues -[ It works ]

I have the exynos 990 version of the S20 FE and as we all know, the 990 is a little bit of a hot mess. However it has quite a lot to give if limited correctly.I'm running One UI 3.1 on android 11. I rooted my FE with magisk and installed Franco kernel manager. The steps below will give you good battery life and performance.
Step 1: Straight up disable the M5 mongoose cores. They are Samsung's biggest undoing.
Step2 : Limit all clock speed to 2Ghz. Trust me, the IPC on the 990 is really damn good and you don't need to worry about performance loss. Forget the benchmarks, everything just works. Getting the last 2.7ghz or 2.5ghz usually requires a significant voltage bump and you mostly wont need the speed.
Step3 : The GPU is actually just fine as is. Try to set the max clock to 370mhz, which sounds ridiculously low, but the 990's GPU was made for 1440p screens, so the UI still remains smooth even at 120Hz. I played Riptide Renegade with this setting and it was very smooth as well. You can play with this number according to how much you game, I, for the most part, don't.
My hypothesis, based on my usage of about 2 months (yeah, i rooted this bad boi about a week from purchase, screw warranty, i'm gonna be alone for life :-( ) is given below >>>>>>
Thermal throttling seems to be due to the M5 cores clocking up like crazy while doing basically nothing. This is probably mostly because Samsung uses their own "energy_step" CPU governor which still needs some work. You can try changing this to schedutil ( which is basically EAS ) and see how it fares. The GPU also ends up underclocking because the GPU has a " joint " governor ( basically ramps up and down with CPU speed to some extent, not entirely sure about this, i may be completely wrong).
I have also have put a battery charge limiter in place at 90% but that doesn't really make a difference. I use my phone quite heavily and at 120Hz but still get about 18 - 20 hours of usage (not 20h screen on time!)if on FULL CHARGE
In fact if you even disable the "BIG" i.g A77 cores, and use only the four A55 "little" ones, it's still good for daily usage. Processing time on the camera takes a bit of a hit, but you can always create a custom profile for that to enable all cores for the camera app. I have my phone skinned with the AOSP-R day/night hex installer theme.
Also huge reasons for rooting :
Tasker > for some insane automation profiles i made
Naptime, Servicely > Free extra battery life
The battery charge limiter to preserve my long term battery life.
Also a GCAM update, the scan3d APKs of BSG are getting rather good. We need to get together an tune the hell out of this sensor to get it to par with the stock camera tho, especially during night. Also no telephoto support, AFAIK. One S20FE confing shall be in the works.
Unrelated shameless self plug : https://www.youtube.com/c/siddharthlh please visit my youtube channel. It does contain some interesting tutorials for tech heads

I'm going to share this thread over on reddit with the army of disgruntled Exytoast users. if this works they will love you as a living god

3mel said:
I'm going to share this thread over on reddit with the army of disgruntled Exytoast users. if this works they will love you as a living god
Click to expand...
Click to collapse

Maybe tag me in the post or something I'm siddharth_lh on reddit. I can help out there itself

done...
https://www.reddit.com/r/GalaxyS20FE/comments/ndnp0s

By "M5 mongoose cores" you mean the ones labeled as "Prime cores"? Just rooted and tried this. Will report back with results.

hectorviov said:
By "M5 mongoose cores" you mean the ones labeled as "Prime cores"? Just rooted and tried this. Will report back with results.
Click to expand...
Click to collapse
Yep

bipolar unbound said:
Yep
Click to expand...
Click to collapse
Did you apply these settings?
How's performance and results been?

bipolar unbound said:
Step 1: Straight up disable the M5 mongoose cores. They are Samsung's biggest undoing.
Click to expand...
Click to collapse
What does this do?
Also I dont wanna set the clock speed any lower is that fine?

Cheetah1020 said:
What does this do?
Also I dont wanna set the clock speed any lower is that fine?
Click to expand...
Click to collapse
if you're changing the max frequency via a kernel tweaking app you can simply change it back if you don't like it.

hectorviov said:
By "M5 mongoose cores" you mean the ones labeled as "Prime cores"? Just rooted and tried this. Will report back with results.
Click to expand...
Click to collapse
How did it go?

Cheetah1020 said:
How did it go?
Click to expand...
Click to collapse
It's been about a week and just 2 days ago I started seeing better battery life. The first 4-5 days were the same as before. I straight up disabled the 2 "prime" cores and the performance is basically the same. Never noticed a hiccup or a slow down. Before I rooted and tried this I was getting about 2.5 hrs SOT before I had to charge and now I'm getting about 3-3.5 hours, just a little more. Seems like less overheating (haven't check temps, just the feeling of it). What I haven't figured out is how to make the change on the GPU frequencies stay, if I set a max, it doesn't cares about it and it still goes above the limit. I'm always using 120 hz on this changes, so I'd say it's worth it.

hectorviov said:
It's been about a week and just 2 days ago I started seeing better battery life. The first 4-5 days were the same as before. I straight up disabled the 2 "prime" cores and the performance is basically the same. Never noticed a hiccup or a slow down. Before I rooted and tried this I was getting about 2.5 hrs SOT before I had to charge and now I'm getting about 3-3.5 hours, just a little more. Seems like less overheating (haven't check temps, just the feeling of it). What I haven't figured out is how to make the change on the GPU frequencies stay, if I set a max, it doesn't cares about it and it still goes above the limit. I'm always using 120 hz on this changes, so I'd say it's worth it.
Click to expand...
Click to collapse
I think should wait for Android 12 to see if it gets better if not then I will do this process

Me too. Great tips!

Go to settings and search for "Limit CPU speed to 70%" and turn it on. Normally gives better battery life. Haven't seen any major bottleneck in performance.

adhikraman said:
Go to settings and search for "Limit CPU speed to 70%" and turn it on. Normally gives better battery life. Haven't seen any major bottleneck in performance.
Click to expand...
Click to collapse
Doesnt it affect performance in games and stuff?

Cheetah1020 said:
Doesnt it affect performance in games and stuff?
Click to expand...
Click to collapse
Haven't experienced any major performance hit in regular usage. Not a heavy gamer so your mileage might vary.

Guys...the last update for Exynos really worked? I've heard about changes in CPU governor that worked!

hectorviov said:
It's been about a week and just 2 days ago I started seeing better battery life. The first 4-5 days were the same as before. I straight up disabled the 2 "prime" cores and the performance is basically the same. Never noticed a hiccup or a slow down. Before I rooted and tried this I was getting about 2.5 hrs SOT before I had to charge and now I'm getting about 3-3.5 hours, just a little more. Seems like less overheating (haven't check temps, just the feeling of it). What I haven't figured out is how to make the change on the GPU frequencies stay, if I set a max, it doesn't cares about it and it still goes above the limit. I'm always using 120 hz on this changes, so I'd say it's worth it.
Click to expand...
Click to collapse
Still that§s a really poor battery performance, and now without warranty... I will take my s20fe to samsung and if they wont repair or change it, I will be also forced to root my phone.

My experience rooting S20+ Exynos 990 following this thread:
TL;DR: Added 6-8 hours of standby battery life just from turning off prime and big cores, haven't checked on screen battery life since I don't use my phone much at work, but I wanted standby time improved.
Before turning off the prime and big cores, I got 11 hours tops on battery life. Seemingly out of nowhere the phone was always warm, despite just sitting at my desk with a very strong signal. I knew that at 12 pm, with 50% brightness, 120hz, and AOD I would expect at least 50% just gone even though I barely even used the damn thing. The straw that broke me, is that even though I was connected to wifi, I could only expect maybe at most, 3-4 hours of screen on time, which finally drove me insane. I checked out the thread sometime ago but was skeptical if it really was worth the trouble since it seemed a lengthy process. Take it from someone who hasn't rooted in a long time, just follow the guides and it all is pretty simple.
After turning off the prime and big cores, immediately thermals were so much better, after 3-5 minutes the phone was much cooler, about 5-8 degrees cooler on the chip area. Since the phone was reset, I couldn't really tell if battery was better. After the using my phone for a week rooted I can tell you, the battery difference is abysmal.
Before, I was struggling to end my day on 30-20%, now I can confidently end my day on 60-50%, depending on how much I used my phone. When idle the phone, barely sips battery, my estimate is that it went from 8-10% just idling, to 3-4% (need to check since I haven't turned on the prime cores ever since rooting). I wasn't willing to sacrifice 120hz so I always kept it on and battery life was good, however I will test with Max Hz on 96 hz, which should extend battery life.
Performance on the little cores is virtually the same, I haven't noticed any hiccups, lag or anything by that matter. I was concerned that on this thread it was mentioned that the camera took a hit, but on the S20+ nothing has changed, maybe the shutter is 0.3 seconds slower but I honestly don't notice or it doesn't bother me at all. Recording high resolution videos is no problem, and nothing really changed for me. Thermals are massively improved, if you're doing a heavy task, like recording, downloading or uploading, or something that you know requires heavy lifting, of course the phone will get warm, but not even close to how hot it would get just idling or doing the same tasks with the big or prime cores.
Since I don't play games I can't really say whether gaming has taking a hit or not, I would say that it depends on the game you're playing. You can always create a profile that enables the prime and big cores on FKM.
Overall I can say this, if you have an exynos 990 phone and getting real sucky battery life, rooting is the way to go. This phone just feels so much better with this extended battery life, and now rooting allows me to mod it as I want it or turn off things that weren't useful. Just be warned you will lose Google Pay and some apps from Samsung that use Knox, but for me what you get in return is so much valuable.
Please let me know if you have other questions from rooting the chip.