Develop Bugs

Undervolting Epic

Hello, I'm a noob with a quick question about undervolting. I am running SyndicateROM Frozen 1.0 EB13/EXT4 with the Twilight Zone kernel. I have the SetCPU.apk installed and I have some profiles and sliders set. I would like to undervolt to save some battery. Is this thing already undervolted? If so, is it only undervolted at 1.2GHz? Is there even a way for me to change anything relating to undervolting?
Thanks for any help.

td25er said:
Hello, I'm a noob with a quick question about undervolting. I am running SyndicateROM Frozen 1.0 EB13/EXT4 with the Twighlight Zone kernel. I have the SetCPU.apk installed and I have some profiles and sliders set. I would like to undervolt to save some battery. Is this thing already undervolted? If so, is it only undervolted at 1.2GHz? Is there even a way for me to change anything relating to undervolting?
Thanks for any help.
Click to expand...
Click to collapse
Undervolting is something that needs to be coded into the kernel by the dev. The best way to save battery would b to use setcpu to a max of 1ghz. An overclocked/undervolted kernel will run at 1.2 ghz while using the same amount of juice that a norma kernel would use at 1ghz
Sent from my SPH-D700 using XDA Premium App

Sh0wNuF said:
Undervolting is something that needs to be coded into the kernel by the dev. The best way to save battery would b to use setcpu to a max of 1ghz. An overclocked/undervolted kernel will run at 1.2 ghz while using the same amount of juice that a norma kernel would use at 1ghz
Sent from my SPH-D700 using XDA Premium App
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and if they've done it right, which they have, 1Ghz will be using less battery than stock at 1Ghz. in theory the lower you set it the less battery you should use, but you dont directly change the undervolting settings, just the clock speed.

Much obliged.

I think that kernel only has undervolting enabled on 1ghz. So if you're on 1.2ghz it will only be overclocked without the undervolt...I think
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cozmonot said:
I think that kernel only has undervolting enabled on 1ghz. So if you're on 1.2ghz it will only be overclocked without the undervolt...I think
Sent from my SPH-D700 using XDA Premium App
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I believe its undervolted at 1.2. Reason I say this is because I flashed the genecide kernal and set it at 1.2 ghz which I know is not undervolted on genecide only 1ghz is I believe and I got crappy battery. On the twilight kernal I'm set at 1.2 and getting great battery. That's just my observation so far.
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hugo87 said:
I believe its undervolted at 1.2. Reason I say this is because I flashed the genecide kernal and set it at 1.2 ghz which I know is not undervolted on genecide only 1ghz is I believe and I got crappy battery. On the twilight kernal I'm set at 1.2 and getting great battery. That's just my observation so far.
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I'm sorry, but you can't say that a great battery is caused simply by an undervolt at 1.2Ghz. The Twilight kernel, from my knowledge, is not undervolted at 1.2Ghz, only at 1.0Ghz. The great battery life you're getting out of the Twilight kernel is because of how it was coded and optimized. My 2 cents.

Twilight kernel is not undervolted on 1.2 ghz. Only 1.0. Read the thread
Sent From My Evo Killer!

What profile does everyone use on the stock cm7 kernel? And why?

I generally stay with on demand but sometimes use conservative. While I like conservative it seems to sometimes take too long to bump up the processor and will cause a bit of lag after wake up.
Sent from my HTC Vision using XDA Premium App

I use Interactive 245 - 1113 MHz. It is similar to on demand but is more responsive in increasing CPU speed. I get great battery life, too.
You can read more about governor details here
https://github.com/CyanogenMod/cm-k...ebcc8db5/Documentation/cpu-freq/governors.txt

c00ller said:
I use Interactive 245 - 1113 MHz. It is similar to on demand but is more responsive in increasing CPU speed. I get great battery life, too.
You can read more about governor details here
https://github.com/CyanogenMod/cm-k...ebcc8db5/Documentation/cpu-freq/governors.txt
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very informative if you read through it. thanks.

Ya thanx for the info on interactive! I'm gonna try it for the next day! Anyone else?
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xsteven77x said:
Ya thanx for the info on interactive! I'm gonna try it for the next day! Anyone else?
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I've been using interactive and conservative. They've both offered good life. I'm using the streamline5 kernel now with conservative though.

Undervolting//how low can your phone go :D

just a little information/ competition to see which SGS2 is the best , i want to see how low of a voltage you can go. I am using Stability test to test out the voltage, 3 round of classic test at 1.73ghz at 1125mV, and it stable, a little scare to go down more but here some info on my SGS2
running
beastmod 4.2
kernel 2.3.6
Was running originally at 1175 but i undervolt to 1125 and running stable at a stable temp of 41-42..
what's yours

be careful with such drastic undervolting at those frequencies, could result in corrupt nand.

G1_enthusiast said:
just a little information/ competition to see which SGS2 is the best , i want to see how low of a voltage you can go. I am using Stability test to test out the voltage, 3 round of classic test at 1.73ghz at 1125mhz, and it stable, a little scare to go down more but here some info on my SGS2
running
beastmod 4.2
kernel 2.3.6
Was running originally at 1175 but i undervolt to 1125 and running stable at a stable temp of 41-42..
what's yours
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Click to collapse
This isn't undrevolting..... this is underclocking.
Undervolting is pretty dangerous with trial and error. The lowest I'll go is -75.
And my frequencies at min 384 and mas 1350 ondemand
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xxKamikazexx said:
This isn't undrevolting..... this is underclocking.
Undervolting is pretty dangerous with trial and error. The lowest I'll go is -75.
And my frequencies at min 384 and mas 1350 ondemand
Sent from my SGH-T989 using xda premium
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no underclocking meaning i would use less ghz than the stock, this is minimizing the voltage on the core.
what your doing is underclock, i put mine fixed on 1.73ghz at 1125mV of voltage

icenight89 said:
be careful with such drastic undervolting at those frequencies, could result in corrupt nand.
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I have never heard of such thing, i'm not doubting you but from over the years, i heard undervolting have positive affect on the CPU by lowering temp and give battery more juice.
where did you get those facts from?

G1_enthusiast said:
no underclocking meaning i would use less ghz than the stock, this is minimizing the voltage on the core.
what your doing is underclock, i put mine fixed on 1.73ghz at 1125mV of voltage
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Ohhhh my mistake, I didn't catch the mv after the 1125 lol that's why I thought you were only messing with ghz ha ha ha
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xxKamikazexx said:
This isn't undrevolting..... this is underclocking.
Undervolting is pretty dangerous with trial and error. The lowest I'll go is -75.
And my frequencies at min 384 and mas 1350 ondemand
Sent from my SGH-T989 using xda premium
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Click to collapse
As far as I know, there are no dangers associated with undervolting. I run at those frequencies too at -112.5 and have never had a problem of any sort.

I run about 1ghz. No under volt with this ics kernel but with my old gb kernel I undervilted with faux -100 at 1ghz...ran cool even with games and video, great battery life. And honestly 1ghz is plenty for snappy fast speed
Sent from my SAMSUNG-SGH-T989 using XDA

i also run 1ghz, runs super smooth across the board

zander21510 said:
I run about 1ghz. No under volt with this ics kernel but with my old gb kernel I undervilted with faux -100 at 1ghz...ran cool even with games and video, great battery life. And honestly 1ghz is plenty for snappy fast speed
Sent from my SAMSUNG-SGH-T989 using XDA
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How did you undervolt by -100?

yoft1 said:
As far as I know, there are no dangers associated with undervolting. I run at those frequencies too at -112.5 and have never had a problem of any sort.
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I don't know if you're familiar with overclocking, but the same type of stability issues can occur. When you're undervolting you can think of your stock speed as an "overclock" and you're just trying to minimize the voltage necessary for stability. If you undervolt too much you can experience freezing, corruption, bad lag, etc. It's all the same process for desktop computers, laptops, and anything else you can play with the voltage.
Personally I'm at -62.5, but after seeing how low people are going I might be a bit more adventurous. Don't use the "Set at Boot" option when you're experimenting.

SupaKid said:
How did you undervolt by -100?
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I did it gradually...and the fact that I was at 1ghz might have also made it possible. Started at -50 since most had said it was safe...then tried 60 then 75 then 90 then maxed at 100...worked beautifully.
I have heard and it is true that phones are made very different. Some exact same models can't oc or UV as high or low as others...I got lucky with a really good model...my old nexus S couldn't oc to 1.4 without freezing while others could.
Sent from my SAMSUNG-SGH-T989 using XDA

Nice!
Could I try your script?

SupaKid said:
Nice!
Could I try your script?
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My bet is he used romanbb's FauxClock (which maxes out at -100mv).

What's the best app to under volt with?
Sent from my SGH-T989 using XDA

asting said:
I don't know if you're familiar with overclocking, but the same type of stability issues can occur. When you're undervolting you can think of your stock speed as an "overclock" and you're just trying to minimize the voltage necessary for stability. If you undervolt too much you can experience freezing, corruption, bad lag, etc. It's all the same process for desktop computers, laptops, and anything else you can play with the voltage.
Personally I'm at -62.5, but after seeing how low people are going I might be a bit more adventurous. Don't use the "Set at Boot" option when you're experimenting.
Click to expand...
Click to collapse
Right, I meant that there are no risks to undervolting in terms of physical damage to your phone, only stability issues which is fixed with a reboot, assuming you didn't set at boot. Overclocking is a bit different in that the risk overclocking presents in addition to stability issues is the risk of overheating which can permanently damage your phone. Undervolting can compensate for this somewhat by letting the power supplied to the processor and thus reducing the risk of overheat.

hiz99 said:
What's the best app to under volt with?
Sent from my SGH-T989 using XDA
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I use system tuner, you can also look for Gideons script that is flashable in cwm to undervolt.

Im undervolted to -75mv for quite some time running a script clocked at 1.518min384
Sent from MY Juggernaut!!!:thumbup:

I have Gideon's OC/UV script. How could I edit it to undervolt by -100?

SupaKid said:
Nice!
Could I try your script?
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yup that's what I used lol.

CM 10 Clock Speed

So I have recently installed CM 10 on my S3 and I'm loving it. However i am a bit worried. The S3 is said to run at 1400 Mhz or 1.4 Ghz. But when I go into settings then performance, the max is set to 1512 Mhz and I didn't touch anything! CM sets it to this by default. My question is does Cyanogenmod overclock your device? Or is that the clock speed that S3 really runs on? My phone has also been getting hot lately but I'm not sure if that has to do with anything at all. Any help is Greatly appreciated!!!

dima470 said:
So I have recently installed CM 10 on my S3 and I'm loving it. However i am a bit worried. The S3 is said to run at 1400 Mhz or 1.4 Ghz. But when I go into settings then performance, the max is set to 1512 Mhz and I didn't touch anything! CM sets it to this by default. My question is does Cyanogenmod overclock your device? Or is that the clock speed that S3 really runs on? My phone has also been getting hot lately but I'm not sure if that has to do with anything at all. Any help is Greatly appreciated!!!
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If the kernel supports it. But stock touchwiz runs at 1.5.
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dxwilliams40 said:
If the kernel supports it. But stock touchwiz runs at 1.5.
Sent from my SGH-I747 using xda premium
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I never changed the kernel. So I shouldn't worry right?

dima470 said:
I never changed the kernel. So I shouldn't worry right?
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Click to collapse
1400 mhz is the max stock clock frequency on the international version (i9300) and 1512 mhz is the stock max freq for the at&t version (i747).
I haven't had any issues with heat. Try running an app to check the CPU temp.
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

Also how is or battery life? I know when my phone gets hot its because something is eating my battery. I by some controls on said apps and I am running at 1.9 with ko heat issues
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Pbwizkid said:
Also how is or battery life? I know when my phone gets hot its because something is eating my battery. I by some controls on said apps and I am running at 1.9 with ko heat issues
Sent from my SAMSUNG-SGH-I747 using xda premium
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The battery life is great I'm not sure why its getting hot

I would use better battery stats just to see what is accessing or CPU. Also u may wipe and do a fresh full clean install. Like I said I have mine over clocked to 1.9 with no undervolting with no issue. But also keep in mind every phone is different.
Sent from my SAMSUNG-SGH-I747 using xda premium

Did you try to undervolt Memory Frequency?

Hi,
we also talk about CPU/GPU undervolt but i never heard someone who tried to undervolt the memory RAM/ROM ? In order to increase battery life.
I'm afraid of triying because no one tried yet, isn't ?

Majority of power goes to cpu and gpu and display. So there is no point on undervolting memory.
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Hi
Are you sure? If you look at Stweak example for Cpu at 800mhz you have about 1015mv and memory get about 1000mv so it's around the same volt. I conclud that memory drain some battery ??
Thanks

You can undervolt memory, just take a look at the Memory/Internal section in STweaks.

You can but you will have hard time figuring out stable values
Sent from my GT-N7100 using xda premium

Ok thanks guys.
Did anyone tried to do this? ??