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[GUIDE] Undervolting for better battery life

Since this is a popular topic and since MSNBERG requested that i make this, i have decided to make it.
THE GUIDE TO UNDERVOLTING
What you will need:
PREFERABLY the application Tegrak OVERCLOCK PAID! can also use set cpu
TEGRAK
LOAD THE OVERCLOCK MODULE
go into the "TWEAKS" section and be sure to select DEADLINE as your scheduler!!!
you will see the option "OPTIMIZATION" go there
now you will see 5 levels to customize
ONLY LEVEL 0 CAN YOU CUSTOMIZE EVERYTHING
Now if you only want to undervolt with no overclock here is the chart you need to use ON GINGERBREAD:
UNDERVOLT SETTINGS
level0 - 1000 - 1155 - 1065 -------this level can change frequency but volts need to change as well
level1 - 800 - 1040 - 1035
level2 - 400 - 955 - 960
level3 - 200 - 835 - 950
level4 - 100 - 825 - 930
once you enter these in you can go to tegraks main menu and go into "PROFILE" and you can save your current settings or choose previous ones.
Here are some overclock values you can use for level 0
LEVEL 0 1100 1100 1090
LEVEL 0 1200 1195 1095
LEVEL 0 1300 1295 1115
LEVEL 0 1400 1315 1125
LEVEL 0 1500 1375-85 1150
LEVEL 0 1600 1400 1175-1200
***THIS WILL BE UPDATED WITH MORE INFO SOON

In my best Mr. Burns voice: Excellent!

Always wanted a undervolting guide. Nice!

:C my phone reboots with these undervolt values for some reason. I'm running Valhalla 1.1(haven't has the time to update and don't have wifi so...) and adrenaline shot X. I also have stability checker off so I'm sure that's not the issue. Its fine at first but then rebootes once I start mulititasking like listening to music, texting and getting on Facebook at the same time. Seems to work fine for everyone else so I don't get what's going on
Sent from my SGH-T959V using XDA App

icy56 said:
:C my phone reboots with these undervolt values for some reason. I'm running Valhalla 1.1(haven't has the time to update and don't have wifi so...) and adrenaline shot X. I also have stability checker off so I'm sure that's not the issue. Its fine at first but then rebootes once I start mulititasking like listening to music, texting and getting on Facebook at the same time. Seems to work fine for everyone else so I don't get what's going on
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Click to expand...
Click to collapse
What governor and scheduler.are.you using
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I'm using ondemand as the governor. I have no idea what a scheduler is.
*edit*
The io scheduler? Well its set to cfq.
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Thanks a lot for this. I have been looking forward to this guide! Awesome work again Dsexton

icy56 said:
I'm using ondemand as the governor. I have no idea what a scheduler is.
*edit*
The io scheduler? Well its set to cfq.
Sent from my SGH-T959V using XDA App
Click to expand...
Click to collapse
Change cfq to deadline
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jager555 said:
Change cfq to deadline
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Click to collapse
THANK YOU!!!! its finnaly working. Haven't had a single reboot yet. You sir just saved me a trip to T-Mobile. I thought there was something wrong with my phone since I was the only one getting that issue.
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jager555 said:
Change cfq to deadline
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Click to expand...
Click to collapse
Thats what I was going to say, good job
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thanks dexter like always!!
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Hi guys,
Sorry for the rookey questions, but :
1. Do I need to install TegraK kernel ? If so, before or after installing TegraK overclock ?
2. Will TegraK OC free version do, or i need the paid version ? what's the difference ?
3. ICY56 - I'm having the exact configuration you have (Valhalla 1.1 and Adrenaline ShotX) can you please explain what changes you noticed regarding battery consumption, and doesn't it affect your phone responsiveness, stability and performance ?
Thanks,
Itzik.

Answers
1) Tegrak will work fine with valhalla, most (if not every) custom rom has the needed kernel already.
2) You need the paid version because free version only allows overclock up to 1.3 you cant adjust anything else.
3) I can't answer as I'm not set up the same, but from my understanding you shouldn't see any negative affects, just increased battery life.

Every time I try to undervolt my phone. It reboots constantly. Even with ICBINB KJ1. Scheduler is set to deadline and governor is set to ondemand. What am I doing wrong?

itzik2sh said:
Hi guys,
3. ICY56 - I'm having the exact configuration you have (Valhalla 1.1 and Adrenaline ShotX) can you please explain what changes you noticed regarding battery consumption, and doesn't it affect your phone responsiveness, stability and performance ?
Thanks,
Itzik.
Click to expand...
Click to collapse
Well I haven't noticed a decrease in performance and stability. The phone actually feels the exact same. As for bettery life, I can't really comment on that yet since I'm in the process of recalibrating my battery and I haven't been on UV long enough to say but so far battery life seems to be a little better
Sent from my SGH-T959V using XDA App

Nice work... tried and works .... 1600mhz looks like unstable in phone....
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wizardslovak said:
Nice work... tried and works .... 1600mhz looks like unstable in phone....
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Click to expand...
Click to collapse
It can be stable you just need to up voltages a lil more
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dsexton702 said:
It can be stable you just need to up voltages a lil more
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Click to expand...
Click to collapse
Well ill play with it more.... usually ill get restarts within few seconds of setting up new parms... thx again...
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Even if I increase voltage it still freezes and then restarts phone @ 1600mhz
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I've had 1664 mhz before stable. It can ne done, every phone will be different with what voltages work. experiment a little. But I wouldn't go to high, don't want a $500 paperweight.
@ 1.3 GHz, this phone its rock solid, so anything higher is over kill imo.
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Change I/O Schedulers? Get max performance?

So i was wondering how to change the I/O scheduler manually all the apps on the market didnt show BFQ even though i know its in the kernel vr is default and the only choices the apps where giving me was Noop or CFQ.
Can you change these manually? Or any apps that include all schedulers?
Also if a kernel has BFS but it is not being used how would you enable it ? Or if a kernel doesnt have it could you add it as say a patch zip in CWM?
It would be nice to set it all up the way i think would work best T.I.A guys
Sent from my tf101 using xda premium 1.59Ghz

Since you seem to know about schedulers, I'm assuming you have (minimal) Linux knowledge so why not try echoing the scheduler to the block device itself?
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brando56894 said:
Since you seem to know about schedulers, I'm assuming you have (minimal) Linux knowledge so why not try echoing the scheduler to the block device itself?
Sent from my Transformer TF101 using xda premium
Click to expand...
Click to collapse
(minimal being the operative word) My problem is i understand how it all works but i cant understand half the terminal codes especially on android terminal.
Basics are fine check memory change permissions etc etc but when it comes to specifics theres no list you can look up online.
If i google search android terminal commands it only gives you maybe a list of 25 commands and none that help with this.
Sent from my tf101 using xda premium 1.59Ghz

Ok found a round about way of doing it using root tools but it doesnt always pick up all available IO Schedulars why is that ? I really want BFQ on my tf101 at the momment i swapped VR for Deadline
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Danzano said:
Ok found a round about way of doing it using root tools but it doesnt always pick up all available IO Schedulars why is that ? I really want BFQ on my tf101 at the momment i swapped VR for Deadline
Sent from my tf101 using xda premium 1.59Ghz
Click to expand...
Click to collapse
So, you managed to change the scheduler? you noticed any increase on performance?

surtrafl said:
So, you managed to change the scheduler? you noticed any increase on performance?
Click to expand...
Click to collapse
Huge improvement but i know it would be even better with BFQ and BFS.
Also ive increased the read ahead on the internal memory to 2048kb which has also helped.
Right now using deadline and deadline shares some charateristics with BFQ which is why i think it would be great.
Ive also changed the gov settings around including sample rate threshold settings etc
Right now its running quick but i really want to find the ultimate sweet spot before icys
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Anyone??
Sent from my tf101 using xda premium 1.54Ghz

Would you be so kind to share with us how you did this?
Also I don't think that BFQ is going to get you too much of an edge over deadline. That is what I use in all the desktop PC's I build with SSD's.

91ludesit said:
Would you be so kind to share with us how you did this?
Also I don't think that BFQ is going to get you too much of an edge over deadline. That is what I use in all the desktop PC's I build with SSD's.
Click to expand...
Click to collapse
You use BFQ or deadline?
Setcpu for cpu and an app called sys tune for root users for read ahead and a few other bits and lastly terminal and text editor for some vm and build.prop experiments
I really wanted the bfs and bfq because they go well together but even deadline and bfs would be nice
Any kernels for the tf with bfs and how do we get at it if its not default??
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Prime stock O/C kernel has BFQ yay but it also has SIO ill test both
i tried all the others they didnt have either and when i first flashed the stock prime one it was acting all funny but this time round i cleared all the caches etc before flashing so maybe that helped anyway all i need now is BFS FTW!!!!!
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[Kernel] SGS2-Streamline

** Default Macnut R1 Kernel
~ SGS2-Streamline Kernel
~~ New Boot Logo
~~ Undervolted
~~ LPM is max at 1188
~ Default Min / Max
~~ 192 Mhz Min per cpu
~~ 1512 Ghz Max per cpu
~ BLN Supported ( Insert credit here, not sure who wrote the codec )
~ Supported I/O's
~~ Noop ( Default )
~~ Deadline
~~ CFQ ( Seems to be Problematic with slow downs )
~~ SIO
~~ BFQ
~~ VR
~ Supported Governors
~~ savagedzen
~~ brazilianwax
~~ intellidemand
~~ wheatley
~~ lagfree
~~ interactiveX
~~ lulzactivev2
~~ minmax
~~ lazy
~~ interactive
~~ conservative
~~ ondemand
~~ scary
~~ smartass
~~ smartassv2 ( Still needs tweaking, scaling fails at times )
~~ lionheart ( Default )
Download:
TMO SGS2
kernel_T989.zip
AT&T I727 SkyRocket
kernel_I727.zip
Mirror:
promiseofcake said:
Hey,
I decided to mirror your kernel:
http://www.promiseofcake.com/xda/macnut-r1-kernel_i727.zip
Download speed is pretty good.
Let me know if you'd like me to remove it.
Lucas
Click to expand...
Click to collapse

FINALLY A FIRST WOOOO YEAHH ALWAYS WANTED TO BE FIRST AT SOMETHING ..
wow we needed a new kernel .. gonna try this thank you..anything i should be aware of problems wise? otherwise listed..

shazbot!!!!

wali01x said:
FINALLY A FIRST WOOOO YEAHH ALWAYS WANTED TO BE FIRST AT SOMETHING ..
wow we needed a new kernel .. gonna try this thank you..anything i should be aware of problems wise? otherwise listed..
Click to expand...
Click to collapse
Not that I can think of, don't have much time to be posting but all I can think of is the bootanimation.zip needs to be named /system/media/sanim.zip

eugene373 said:
Not that I can think of, don't have much time to be posting but all I can think of is the bootanimation.zip needs to be named /system/media/sanim.zip
Click to expand...
Click to collapse
good job bud. your work is always amazing..keep it up and thank you for the time spent and spending to it..
and i saw you were going through some family stuff. i hope things get better.. i know i being 27 got too many responsibilities and sometimes it just hits me on my face but keep ya head up and keep going @ it.. things will get better ..

Great New Kernel!! Thnx a lot Man!!!!!!

Yessssss!!!!! Flashing
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BaconStep said:
shazbot!!!!
Click to expand...
Click to collapse
I always wanted to hump Mindy.

nice... downloading now

Sweet, may have to try this, faux is sucking out for me.

Defaulted to SIO scheduler for me. Changed ala system tuner to NOOP. What is it undervolted by as the default?
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Gray job!
NexusMod 4 and faux123 version 10

eugene373 said:
~~ 1512 Ghz Max per cpu
Click to expand...
Click to collapse
Thanks for the new Kernel!
Just curious, but does it take a lot of work to add overclocking ability to kernels?

InstigatorX said:
Defaulted to SIO scheduler for me. Changed ala system tuner to NOOP. What is it undervolted by as the default?
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Click to expand...
Click to collapse
sio is better than noop

all I can say to this kernel.... is wow. I'm in love with the lionheart governor. Haven't got around to trying the rest but its sooo smoooth. Underclocked to 1.242 and its still running nice. I was also able to underclock and additional -50mV and running stable. Sorry faux, I've turned traitor

icenight89 said:
sio is better than noop
Click to expand...
Click to collapse
Why? I read about all of them, but can you explain? This is what i've found
SIO
Simple I/O scheduler aims to keep minimum overhead to achieve low latency to serve I/O requests. No priority quesues concepts, but only basic merging. Sio is a mix between noop & deadline. No reordering or sorting of requests.
Advantages:
Simple, so reliable.
Minimized starvation of requests.
Disadvantages:
Slow random-read speeds on flash drives, compared to other schedulers.
Sequential-read speeds on flash drives also not so good.

Cm7 compatible?
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hansmrtn said:
Cm7 compatible?
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Click to expand...
Click to collapse
No, based on Samsung based roms.
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hansmrtn said:
Cm7 compatible?
Sent from my SGH-I727 using XDA
Click to expand...
Click to collapse
Nope.
xcrazydx said:
Why? I read about all of them, but can you explain? This is what i've found
SIO
Simple I/O scheduler aims to keep minimum overhead to achieve low latency to serve I/O requests. No priority quesues concepts, but only basic merging. Sio is a mix between noop & deadline. No reordering or sorting of requests.
Advantages:
Simple, so reliable.
Minimized starvation of requests.
Disadvantages:
Slow random-read speeds on flash drives, compared to other schedulers.
Sequential-read speeds on flash drives also not so good.
Click to expand...
Click to collapse
Because it has minimal overhead and doesn't do any requeueing, only processing in order, which most of the time is good in our case as we want to give the task in use priority, which sio does

This kernel is awesome! I love it.
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best no frills settings

I'm Using razodroid v4.0 and it's great but i need more battery saving so ,,
what are the best settings for no frills ?
my defaults are ..
max 600
min 245
governor : ondemand
i/o scheduler : noop
thanks in advance pls reply soon

Battery saving best is 600 245 power save and sio

dont use powersave! you'll face a lot of lags and re-boots!
use set cpu instead of no-frills.
min:245 max:480 (use 600 if ur rom lags but 480 is enough for me )
governor:smartassv2 (actually lulzactive is best for battery life but you wont find it in galaxy fit roms :/)
i/o:sio
now in set cpu go to profiles section. Create new profile, choose "SCREEN OFF" and set min:122 and max:245 governor: ondemand priority:50
but disable profiles if you listen to songs with headphones.

But bro I read in.forum that never lower than 245 mhz

androidnandroid said:
But bro I read in.forum that never lower than 245 mhz
Click to expand...
Click to collapse
huh? why so? and where exaclty you read it??

becouse they use same battery , eaven sometime 122 use more, and phone is realy slow opening afther locked on 122 . btw no need to set cpu profiles when using smartassv2 or lilgv2 because they have it own sleeping profile .

i read that if below 122 your phone cant overcome that frequency and if your phone on dead sleep than your phone wud me not reacheble or will show people calling as switchof...and if difference of frequency is more than more battery consumption check xda search about io and governor a guy explained every io and governor...check that
---------- Post added at 07:42 PM ---------- Previous post was at 07:41 PM ----------
djozaa said:
becouse they use same battery , eaven sometime 122 use more, and phone is realy slow opening afther locked on 122 . btw no need to set cpu profiles when using smartassv2 or lilgv2 because they have it own sleeping profile .
Click to expand...
Click to collapse
you are exactly right bro...

My fave Nofrills setting :
Gov : Smartassv2
I/O : Vr
Min 245 max 600.
Still using it until now...
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vr better or sio???

Sio is better. Then deadline and noop. Btw sio maybe give slight less benchmark score. But it doesent matter
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thanx bro

i don't have smartassv2 but i have smartass :/
thanks guys

U got maybe lilgv2 ? That is moded smartasv2 for mini/fit by squadzone.
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djozaa said:
U got maybe lilgv2 ? That is moded smartasv2 for mini/fit by squadzone.
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Click to collapse
yes i have lilgv2 is it good ?

Yes
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Sio is good for benchmarking...
But I like Vr more because it so fast when you try to open any apps...
Just try n see...
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hmmm...ok bro will review it for 1 day

cygnus39 said:
Sio is good for benchmarking...
But I like Vr more because it so fast when you try to open any apps...
Just try n see...
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Click to expand...
Click to collapse
so my current settings now are
600
245
lilgv2
vr
i'll feedback next hours

I still sugest sio over anything. It has been proven that is best overall performance and battery
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no frills
What is the best no frills setting for fast downloads

[Q] What is the difference between a kernel - governor - and speedtweak

Hello,
I am by no means a developer but have had a few android phones and today started thinking about what the difference is between the following...
A kernel
A Governor
And then how does speedtweak fit into the equation?
Seems like a kernel tells the different hardware in the phone how to work - then the governor is kinda like regulating how the processor works and handles tasks - but the speed tweak really confuses me - is that just kind of a way to regulate how the governor works?
Thanks in advance for your help and for being nice in your reponse.

You are right about what the kernel is doing. The governor only controls how the cpu goes from min to max frequency. A speedtweak changes some of the kernel parameters (most of the time).
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Thanks so much man.
Cheers.
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