What do kernals do?? - EVO 4G Q&A, Help & Troubleshooting

I'm using XDA app and been searching forums on what kernals do, I'm running cm7 latest nighty with tiamat latest version. Not sure what all the features are , I know it does overclocking and under and voltage adjustments, just wondering if it was worth going to tiamat from cm7 kernal and if it gives better performance and better battery? Thanks
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fierceeagle2003 said:
I'm using XDA app and been searching forums on what kernals do, I'm running cm7 latest nighty with tiamat latest version. Not sure what all the features are , I know it does overclocking and under and voltage adjustments, just wondering if it was worth going to tiamat from cm7 kernal and if it gives better performance and better battery? Thanks
Sent from my PC36100 using XDA Premium App
Click to expand...
Click to collapse
Different kernels work better for different phones... give them a try (give it a few days) and see which works best for you! Like you said, undervolting, under/overclock, BFS, HAVS, CFS, all features to increase battery life and/or performance!

Thanks for reply
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The kernel is the part of the operating system that is in direct control of the hardware, its the lowest level of the OS. It controls the frequency the CPU runs at, how much power to pull from the battery, how to schedule I/O, how many frames per second animations run at, and things of that nature.
In my opinion, rooting is almost useless without flashing a custom kernel. Thats really the only way to increase the performance of your phone.

cobirch2 said:
The kernel is the part of the operating system that is in direct control of the hardware, its the lowest level of the OS. It controls the frequency the CPU runs at, how much power to pull from the battery, how to schedule I/O, how many frames per second animations run at, and things of that nature.
In my opinion, rooting is almost useless without flashing a custom kernel. Thats really the only way to increase the performance of your phone.
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Click to collapse
Thanks..
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Related

Battery Tweaks

I come from the Eris forums, where battery tweak threads were plentiful. Can anyone direct me to such a thread concerning (rooted) INC2s? I'm on CM7, and battery life is so-so on heavy usage. I like to think rooting brings opportunities for ridiculously good battery life, but not w/o some tweaking. Help?
For the most part a majority of devs include there own tweaks into their respected roms. Most will flash a custom kernel which allows overclocking and undervolting. Like I am running miui with areos kernel oc 1.2 and undervolted -50. It is now 9pm and I have been unplugged since 8 and still have 70% with medium heavy use.
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Check out rom toolbox but you gotta pay for the pro version to get battery mods
Linch89 said:
Check out rom toolbox but you gotta pay for the pro version to get battery mods
Click to expand...
Click to collapse
I'd rather not pay $5 for something that is only simplifying what I can do myself for free, ya know? I know in the Eris forums they had recommended CPU settings that I could do myself in the CM settings; do we have stuff like that for the INC2?
i usually get at least a day in a half with heavy use. You just need to experiment with custom kernals and different voltages. Not really a simple answer, you need to do the research yourself.
How do I alter voltage? I don't remember that feature on the Eris...
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natemup said:
How do I alter voltage? I don't remember that feature on the Eris...
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Click to expand...
Click to collapse
Incredicontrol from the market.
Try Drellisdee's kernel, #21. It's already undervolted and can be overclocked.
natemup said:
How do I alter voltage? I don't remember that feature on the Eris...
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Click to collapse
On cm7 you'll need aerovans .8 kernel which you can get on rootzwiki. Then install incredicontrol from the market. I undervolted mine 75-100 on all and had no issues with excellent battery.
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http://androidforums.com/htc-droid-incredible-2/326546-incredible-2-battery-saving-tips-thread.html
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#1 cause of battery drain: Global mode enabled. Make sure to disable it in settings/calls and set it to cdma only. My battery basically doubled after doing that. I figured that out the first week I had it.

[Q] What's the best GB aosp kernel for battery?

I'm having major battery drain with the latest CM7 stable release. I've lost 25% in standby in about 90 minutes....my phone was charged while off to 100% last night, and when I turned it on I left it alone....didn't even turn the screen on. when I came back an hour later it was at 78%
Can someone please recommend a good battery saving kernel, please....I'm pulling my hair out finding one. For such a popular phone the choices seems really sparse
Every phone handles kernels differently but one of the best ones so far on my phone is here.
http://forum.xda-developers.com/showthread.php?t=1546878
[KERNEL][WIP] Mason kernel for supersonic v0.14
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Savaged Zen 2.2.1 bfs undervolted -50mv with sbc. Gets a little hot with sbc but it can be turned off while not charging
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smatherlee said:
Every phone handles kernels differently but one of the best ones so far on my phone is here.
http://forum.xda-developers.com/showthread.php?t=1546878
[KERNEL][WIP] Mason kernel for supersonic v0.14
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Click to collapse
+1 and you can undervolt with this kernel as well, I have it set at -50mv running an AOSP rom with COD tweaks and i'm at 17hrs with 78% battery left
Mason kernel
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BigSmoke53 said:
Mason kernel
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+1
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Wish I still had my EVO to give this a shot with cm7. I miss cm roms. Someday soon I hope I will be reunited with them
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smatherlee said:
Every phone handles kernels differently but one of the best ones so far on my phone is here.
http://forum.xda-developers.com/showthread.php?t=1546878
[KERNEL][WIP] Mason kernel for supersonic v0.14
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Click to expand...
Click to collapse
I agree with this kernel. I use SBC as well, it will stop the 10% drop in battery whenever you unplug it.
Thanks for all the wonderful responses, everyone!! I'm giving mason a shot first, since it seems so popular
I'm trying Mason G - v0.14 sbc uc'd to 729mhz, powersave gov....but I can't find any options to uv/ov. Does set cpu not work properly with this kernel? What app/script should I be using?
for undervolt if it is sysfs HAVS enabled you need to get vipermod. If it just says undervolt then it may have a pre-set undervolt determined by the dev.
hp420 said:
Thanks for all the wonderful responses, everyone!! I'm giving mason a shot first, since it seems so popular
I'm trying Mason G - v0.14 sbc uc'd to 729mhz, powersave gov....but I can't find any options to uv/ov. Does set cpu not work properly with this kernel? What app/script should I be using?
Click to expand...
Click to collapse
Search vipermod script. Download it, flash in recovery, then run command in terminal then chose voltages
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vipermod...gotcha!! Thanks guys
Isn't set CPU for sense Roms? Go get Rom toolbox and it does it all.
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BigSmoke53 said:
Isn't set CPU for sense Roms? Go get Rom toolbox and it does it all.
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Click to collapse
I've been using setCPU for my xperia & neXus for over a year each I'll try romtoolbox, though...thanks!
BigSmoke53 said:
Isn't set CPU for sense Roms? Go get Rom toolbox and it does it all.
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Click to collapse
I'm using setcpu right now with CM7, Tiamat kernel. Phone was fully charged early this morning, and is still at 86% battery charge, but I've used it for less than half an hour, and I also use Juice Defender.
BigSmoke53 said:
Isn't set CPU for sense Roms? Go get Rom toolbox and it does it all.
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Click to collapse
Setcpu works with anything, sense or not
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Evocm7 said:
Savaged Zen 2.2.1 bfs undervolted -50mv with sbc. Gets a little hot with sbc but it can be turned off while not charging
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Click to collapse
On GB is was running this same setup and my battery life was nothing short of amazing. I had a good 15-24 hours depending on use.
best cm7 kernel?
i just recently started using mason. its pretty awesome. before that i used tiamat sbc also no problems. just try which ever ones you think you may like every couple days to see which one works best for you. i also give the kernel about 10 minutes to bake in every time before i unlock it. i dont know if thats been proven to help but it cant hurt and seems to work well for me.
I've been running mason sbc for about a week now. I had to use a combination of vipermod and smurfed out scripts to get the kernel set where I wanted it. I noticed the kernel was set for BFS by default, which I've never been a big fan of, due to its power consumption....so smurfed out let me set the scheduler to CFS, which is much more conservative and doesn't sacrifice any i/o speed, imho. Then I used vipermod to uv -25MHz so it wasn't such a battery-hog. Underclocked, undervolted, and set to CFS seems to be my winning combo!!! I get no less than 3 hours of constant screen time (streaming video, browsing the web, etc.) and enough standby to last me all day so I don't have to carry my charger with me anymore.
With every other android I've ever owned, setcpu does everything I've mentioned changing in this post...so when it wasn't working, I had no idea what to do.
Thanks so much guys!!! I couldn't have done it without all your help....HTC is in a world all its own in the android scene since they use so many different things that no other manufacturers do. It made me want to pull my hair out until you guys came along to help me out

CPU overclocking

I don't really know much about overclocking but it is it worth it? And how do I do it?
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schust3r5 said:
I don't really know much about overclocking but it is it worth it? And how do I do it?
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Well its really a matter of taste. Overclocking makes the phone a bit snapier and makes large games a bit quicker, but it also eats away at your battery faster. In my opinion overclocking is not worth it based on the small performance boost and larger battery drain. I actually under clock and undervolt to get max battery life with little or no hit to performance.
To over/under clock/volt you need to be rooted and install a kernel that supports the features and is compatible with your type of rom. From there you can use scripts or one of several apps on the market to change the values to your liking.
schust3r5 said:
I don't really know much about overclocking but it is it worth it? And how do I do it?
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Click to collapse
It makes your CPU run faster and things MAY be smoother for you. Is it worth it? Depends on how concerned for stability you are. Things could be more unstable for a possibly unnoticeable performance gain. This is coming from someone who enabled overclocking in his kernels.
If you think it's still worth it, you'd need to flash an appropriate custom kernel for the ROM you're using and install an app such as nofrills or incredicontrol or setcpu or system tuner (to name a few) to activate overclocking.

Quick question about a new kernel

So the other day I installed an unofficial version of cm9 on my Evo. As many of you know, cm comes with options to over clock out of the box. Sadly, with the stock kernel you can only go so far. I found a new kernel online, and flashed it onto my phone, only to find out it ruined the rom, forcing me to reflash cm9. I was wondering if there are any kernels that I can install to overclock my phone further? Pics included
fro453 said:
So the other day I installed an unofficial version of cm9 on my Evo. As many of you know, cm comes with options to over clock out of the box. Sadly, with the stock kernel you can only go so far. I found a new kernel online, and flashed it onto my phone, only to find out it ruined the rom, forcing me to reflash cm9. I was wondering if there are any kernels that I can install to overclock my phone further? Pics included
Click to expand...
Click to collapse
atyoung's Mason ICS kernel should work...
May I ask why you have the desire to.overclock so violently? Most the time, underclocking will even show no loss In performance and save battery. All times I have overclocked, I've never noticed a major difference.. it may be slight but not enough for me to care..
why is your min/max the same?
The rom I downloaded is a little laggy, just wishing to speed things up a bit.
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fro453 said:
The rom I downloaded is a little laggy, just wishing to speed things up a bit.
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Ummm... You'll get terrible batt life with those settings... Min/max are the same
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One more thing.. pegging your CPU at max ghz will eventually destroy your device. The EVO is made with a single core 1 GHz snapdragon and so anything really over 1GHz will really put a strain on your processor. Best advice would be to either flash a new kernel, ROM, or find some tweaks to decrease lag. 1.2GHz isn't healthy for your phone...

Kernel inquiry

Ive been working(slowly due to work) on a kernel for the lgog. I've been able to do some pretty heavy overclocking but I need some community preference.
Overclocking obviously causes more heat and reduced battery life. Higher overclocks require overvolting beyond required to maintain 1.5ghz set by Qualcomm/lg. Keep this in mind before asking for 2.0+ overclocks in daily kernels.
What top clock are you guys wanting for a performance kernel? Also are you guys interested in a reduced clocks kernel. 1.0-1.2 top clock with a lowered low end clock along with lower GPU and system clocks.
Personally I Dont see a big need in heavy overclocking on a quad core. However I would like some opinions before I release test kernels. I will attempt to see just how far the lgog can go at least once, but that will take around 10-20 test kernels to find the top speed.
Comment below this line ___________________
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I like the idea about under clocking. This bad boys fast already. The battery savings would be nice.
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The highest overclock that I would like to see is around 1.7-1.8Ghz even though I don't know what I would need my phone running that fast for. Now the under clocked kernel sounds very interesting .
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Would like to see underclocked as well. Phone is plenty fast.
Sent from LG Optimus Prime G
I don't see a need for anything over 1.6. The underclocking idea sounds great though
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Just looking at how this governor uses CPU, it hardly uses the middle ranges. Maybe some better governors? Just another thought.
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I would be interested in a kernel with A 1.8 top speed slightly lower bottom end and different governors. While 1.5 is fast 1.8 with a better governor along with a 128 minimum speed would be a good comprise kernel
I don't know of anyone having speed issues to warrant an over clocking kernel, seems more for bragging rights.
I think most people would want a kernel that saves battery but doesn't compromise on speed. Also, have you looked into the wake lock issue yet?
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I would love to see some undervolting, while maintaining a decent clock rate. Battery life is important, but i love to game too and wanna see consistent framerates.
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I say use 1.7 max
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is it hard to do 2 kernels? one for everyday use and other for some extra situations...
underclocked and overclocked...
as for me...i would like to see
-voltage control in apps (undervolting)
-usb otg
engine95 said:
Just looking at how this governor uses CPU, it hardly uses the middle ranges. Maybe some better governors? Just another thought.
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Click to collapse
You can pick other governors already but i do plan on adding a couple extra
bizzshow26 said:
I would be interested in a kernel with A 1.8 top speed slightly lower bottom end and different governors. While 1.5 is fast 1.8 with a better governor along with a 128 minimum speed would be a good comprise kernel
Click to expand...
Click to collapse
You won't see a 128 min. I'll be lucky if I get 256 stable, but it is in the works
johnq54 said:
I don't know of anyone having speed issues to warrant an over clocking kernel, seems more for bragging rights.
I think most people would want a kernel that saves battery but doesn't compromise on speed. Also, have you looked into the wake lock issue yet?
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Click to collapse
Wake lock fixed by Qualcomm. Just gotta add it.
agurzhiy said:
is it hard to do 2 kernels? one for everyday use and other for some extra situations...
underclocked and overclocked...
as for me...i would like to see
-voltage control in apps (undervolting)
-usb otg
Click to expand...
Click to collapse
I'll probably use faux's volt control. This is my first Qualcomm kernel so I've been mainly running through it. The n4 is far far far cleaner. Our source is a jumbled mess to an extent.
Also the other devs have found a way to run n4 stock ROM with kernel. However finding the best way for everyone to benefit is being sought after.
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Faster=Better
Faster is always better in my book. Pump that baby into overdrive!
if n4 kernel is portable to us, than usb otg - too???
and is n4 better?
Noobafied said:
Faster is always better in my book. Pump that baby into overdrive!
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Click to collapse
Something to consider. The n4 if pushed to far will actually brick. Our device might be the same.
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Haven't looked but how far can most n4 go I hope it can take at least a 300mhz oc.
jokersax11 said:
Wake lock fixed by Qualcomm. Just gotta add it.
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Click to collapse
I am having huge wakelock issues. Will this is implemented in a future kernel from you or is this already available to use?
I think he meant Quallcom fixed it with a patch so once the kernel is build he can add that patch into his kernel along with whatever other option he chooses to build it with
bizzshow26 said:
I think he meant Quallcom fixed it with a patch so once the kernel is build he can add that patch into his kernel along with whatever other option he chooses to build it with
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Click to collapse
Correct
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bizzshow26 said:
I think he meant Quallcom fixed it with a patch so once the kernel is build he can add that patch into his kernel along with whatever other option he chooses to build it with
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Click to collapse
I know what he meant, I saw a kernel that has been floating around, didn't know if that had it implemented or not.
jokersax11 said:
Correct
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Thanks man!

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