Develop Bugs

[Q] Undervolt for better battery performance

I was reading around some threads and i came to see that someone created a Kernel for the Sammy GSII where they could undervolt the ram, lcd, and cpu. Just asking if it could probably be possible for some Devs so take a look at that since our display makes a huge dent on battery life..
Here is what they listed as changes:
"add frequencies -> 1.4GHz, 1.2GHz, 600MHz
Voodoo Sound Version 8 (thanks to supercurio & richardtrip)
update ext4 (thanks to richardtrip)
under voltage -> RAM(1.8v to 1.6v) and LCD(3.3v to 2.4v)"

clik HO!NO!'s kernel palace thread

HO!NO!'s kernals only UV the CPU. He's talking about the ram and screen as well.
Edit: My buddy's HOX had 77% left after 8 hours of moderate usage. Made me very jealous..

rsalan said:
HO!NO!'s kernals only UV the CPU. He's talking about the ram and screen as well.
Edit: My buddy's HOX had 77% left after 8 hours of moderate usage. Made me very jealous..
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i understood fully what he was talking about.
and my comment still stands, if he is interested in what he wants, he should ckick the ****ing kernel palace thread.
jesus ****ng christ.

Dude relax lol..
He should make a thread here as he is questioning all the devs, not just HONO.

i am relaxed.
peeps that run around *correcting* others based on wrongly ASSUmming they know better will always get a reply in kind from me. you got that.
and i didn't say move the thread, the thread here is fine and the thread is fine in general, i never suggest otherwise. i said my comment to click the HO!NO! kernel palace thread is on point to the topic, as opposed to your comments correcting others and being jealous of other people's smart phones, neither of which have anythiing to do with the topic.

[????????]Overclocking Samsung Galaxy Y!!!!!!!!!!

I found this overclocking tip from this site http://galaxyygamingarena.blogspot.in/2012/08/1ghz-overclock-simply.html Can anyone verify this is legit or fake?????????????????????????????????

l0lh4rd said:
I found this overclocking tip from this site http://galaxyygamingarena.blogspot.in/2012/08/1ghz-overclock-simply.html Can anyone verify this is legit or fake?????????????????????????????????
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are you flash this kernel or not i avoid t flash this and lost my mob

I want to know whether its fake or not? I don't want to take the risk of damaging my phone

l0lh4rd said:
I want to know whether its fake or not? I don't want to take the risk of damaging my phone
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Dont try it bro. Look at meruk kernels thread in development section.there is no feature called overclocking.
I have heard in past that he made a overclocking kernel which was abandoned.
My advice.most the developers are in xda.most blogs copy paste their work.do a search in xda before doing something risky.
send from Gods Own Country........

It works, you can overclock to 900MHz and also, 1GHz, but it drains battery like anything, almost 5x times, mines over at just 3 hours with normal usage, and some fcs with multi tasking, it isnt stable. So better not use it and btw, if something like this comes, it comes first at xda, dont waste your time reading other blogs.
BTW, its copied from merruk kernel thread from development section.

I overclocked with this kernel
Improved benchmark score
But drains battery very fast
Better use a good kernel....
Sent from my GT-S5360 with chobitsv2 and white kernel...

Kernel Questions...

Hey all, I am running KT747 Kernel on Liquid Smooth ROM. I just have a few questions about kernels and tweaking them (and yes I do know about THIS thread, but it is very cluttered)...
1. What is over-clocking/under-clocking and what does it do? Also, how do I do it?
2. What is Governor and I/O scheduler and what do they do? Also what are the differences betwteen all of the Governors and I/O Schedulers?
3. How do I tweak my kernel to get a really good benchmark score?
4. What are the voltages?
If you can answer any of these questions I'd greatly appreciate it. Thanks to all!

Joe0113 said:
Hey all, I am running KT747 Kernel on Liquid Smooth ROM. I just have a few questions about kernels and tweaking them (and yes I do know about THIS thread, but it is very cluttered)...
1. What is over-clocking/under-clocking and what does it do? Also, how do I do it?
2. What is Governor and I/O scheduler and what do they do? Also what are the differences betwteen all of the Governors and I/O Schedulers?
3. How do I tweak my kernel to get a really good benchmark score?
4. What are the voltages?
If you can answer any of these questions I'd greatly appreciate it. Thanks to all!
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Click to collapse
If you read the OP of the Team Kernelizer's thread it'll answer most of the questions.
1. over-clocking/under-clocking refers to adjusting the speeds which your processor is allowed perform at. Over-clocking means that you can set it as a higher speed and under clocking is that you can set it at a lower speed.
2. There are many different threads on what each of the govenors and schedulers do. In the OP of ktoonsez's kernel thread there are links which give pretty good explainations as to what each of them do.
3. Tweaking your kernel is going to be something that is pretty much dependent on your phone and finding the proper pairing for your phone of frequencies, govenor, and voltages for each individual frequency step.
4. The voltage settings are how much power the processor is allowed to pull while it's at each individual frequency step. These can be changed to optimize performance as well as increase battery life. undervolting too much though could result in issues with your phone.
All of this is very much trial and error.
In order to change any of the kernel settings, use the ktweaker app that was installed on your phone when you installed the Ktoonsez kernel. The app should be in your app drawer.

tkepk181 said:
If you read the OP of the Team Kernelizer's thread it'll answer most of the questions.
1. over-clocking/under-clocking refers to adjusting the speeds which your processor is allowed perform at. Over-clocking means that you can set it as a higher speed and under clocking is that you can set it at a lower speed.
2. There are many different threads on what each of the govenors and schedulers do. In the OP of ktoonsez's kernel thread there are links which give pretty good explainations as to what each of them do.
3. Tweaking your kernel is going to be something that is pretty much dependent on your phone and finding the proper pairing for your phone of frequencies, govenor, and voltages for each individual frequency step.
4. The voltage settings are how much power the processor is allowed to pull while it's at each individual frequency step. These can be changed to optimize performance as well as increase battery life. undervolting too much though could result in issues with your phone.
All of this is very much trial and error.
In order to change any of the kernel settings, use the ktweaker app that was installed on your phone when you installed the Ktoonsez kernel. The app should be in your app drawer.
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Click to collapse
Thank you! I already know about the Ktweaker app as I've used it already because I followed the steps in the thread and tweaked my kernel already for the "good battery+performance" setting. Although not gonna lie, I did not know what I was tweaking lol. I do notice amazing battery life though... after those tweaks I got 60hrs with 3 1/2 hrs of on screen time (4200mAh extended battery). I just wanted to clarify what I was doing. Plus I always hear about over-clocking/under-clocking but I don't know what it is or how to do it.

Joe0113 said:
Thank you! I already know about the Ktweaker app as I've used it already because I followed the steps in the thread and tweaked my kernel already for the "good battery+performance" setting. Although not gonna lie, I did not know what I was tweaking lol. I do notice amazing battery life though... after those tweaks I got 60hrs with 3 1/2 hrs of on screen time (4200mAh extended battery). I just wanted to clarify what I was doing. Plus I always hear about over-clocking/under-clocking but I don't know what it is or how to do it.
Click to expand...
Click to collapse
Over/under clocking and under volting are explained/described pretty well in the OP of the team kernelizer's thread. That being said that sounds like some pretty great battery life.

tkepk181 said:
Over/under clocking and under volting are explained/described pretty well in the OP of the team kernelizer's thread. That being said that sounds like some pretty great battery life.
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Ever since I did those tweks I've been averaging 2 Days 12 hrs (60hrs total) per charge.... freakn awesome!

Thanks for the info, answered my question as well =p
Sent from my SPH-L710 using xda app-developers app

Theres a ton of good links in the following thread too
http://forum.xda-developers.com/showthread.php?t=1941195
As for CPU governors and stuff, you want the "setcpu guide on how to use" and "android governors explained" links

[kt747 oc] Flirting with high cpu temps

Specs:
SGH-I747
Cm 10.1 nightly 4/11/2013
Kt747 3.4 kernel 4/11/2013
smartassH3 govenor
sio i/o
This has probably been posted before but I really want this answered officially.
I've got my cpu at 1890mhz and I've been hitting 50-56C cpu temps (32-36C battery temp) and I deleted my sys file that throttles the cpu. But unofficially this
dual core chipset can apparently handle up to 100C so mid 50s shouldn't be a cause of concern right?
Thank you

Every phone is different and every phone will react different to overclocking and temperature.
Is it a reason to be concerned... probably not.
Would I put my phone through that type of stress for an extra 350mhz I don't need? No way.
Also think about this mind puzzling question: what did you just do... You asked a question... So what forum do you think you should have posted this in?
Answer: probably the one made specifically for questions. I know it's a hard concept to grasp but come on man
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

Please read forum rules before posting
Questions and help issues go in Q&A
Thread moved
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Kernel with Underclocking (300 Mhz)

Hi guys,
I have been testing many different ROMs and kernels so far and still haven't found a kernel which really permits underclocking below 1113 Mhz (for big cores) and 633 Mhz (for little cores).
Do you know any kernel which allows setting cores for a minimum of 300 Mhz for instance?
Many thanks.

Patoilo said:
Hi guys,
I have been testing many different ROMs and kernels so far and still haven't found a kernel which really permits underclocking below 1113 Mhz (for big cores) and 633 Mhz (for little cores).
Do you know any kernel which allows setting cores for a minimum of 300 Mhz for instance?
Many thanks.
Click to expand...
Click to collapse
Maybe Agni kernel do this.

IceCold Kernel up until (including) R3.5 has this feature. The feature was then removed without reason by the developer, but you can still download R3.5.
I'm using (and underclocking) it with Havoc OS 2.5 and it works great.

JosephusQuint said:
IceCold Kernel up until (including) R3.5 has this feature. The feature was then removed without reason by the developer, but you can still download R3.5.
I'm using (and underclocking) it with Havoc OS 2.5 and it works great.
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Click to collapse
Thanks a lot for the tip. I will flash it to test.
Any experience of those builds till 3.5 working with MIUI-based ROMs?

Patoilo said:
Thanks a lot for the tip. I will flash it to test.
Any experience of those builds till 3.5 working with MIUI-based ROMs?
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Click to collapse
I have never used it for MIUI-based-ROMs, so I can't speak on that.

JosephusQuint said:
I have never used it for MIUI-based-ROMs, so I can't speak on that.
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Click to collapse
I will see how it goes and will post the results here.
But I am also interested in testing the Havoc ROM. I actually did it before but got poor battery results. Do you have an idea of your screen-on-time with the combo Havoc + IceCold 3.5?

Patoilo said:
I will see how it goes and will post the results here.
But I am also interested in testing the Havoc ROM. I actually did it before but got poor battery results. Do you have an idea of your screen-on-time with the combo Havoc + IceCold 3.5?
Click to expand...
Click to collapse
I will make a screenshot tomorrow evening of the battery life, and put it in the thread. (It's bedtime here)

JosephusQuint said:
I will make a screenshot tomorrow evening of the battery life, and put it in the thread. (It's bedtime here)
Click to expand...
Click to collapse
Thank you in the meanwhile, I clean flashed IceCold 3.5 Pie and minimum big cpu still stays at 1113 MHz
No option to set 300 MHz

JosephusQuint said:
IceCold Kernel up until (including) R3.5 has this feature. The feature was then removed without reason by the developer, but you can still download R3.5.
I'm using (and underclocking) it with Havoc OS 2.5 and it works great.
Click to expand...
Click to collapse
are you sure he removed it without given a reason.?? it was removed caused those frequencies was useless.

raptorddd said:
are you sure he removed it without given a reason.?? it was removed caused those frequencies was useless.
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Click to collapse
He removed it, because he thought them useless. What is useful and what isn't, is of course subjective, and I for one disagree with his view. He decided it wasn't worth keeping in; however, the feature was working and not "useless" in the sense that it was incomplete.
Regardless, this is not a discussion for this thread; you may ask him directly in his.

The underclocking frequencies were removed due to the Pie firmware disabling the ability to underclock below 1113MHz.
IceCold R3.5 + Oreo FW should still work.

JosephusQuint said:
He removed it, because he thought them useless. What is useful and what isn't, is of course subjective, and I for one disagree with his view. He decided it wasn't worth keeping in; however, the feature was working and not "useless" in the sense that it was incomplete.
Regardless, this is not a discussion for this thread; you may ask him directly in his.
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bcoz its not useful at all. its all inefficient frequency and he is right. we all tested that alot and found it to be as good as previous undercocked 300mhz freq. just test and see instead of saying this.
people dont even try and complain

JosephusQuint said:
I will make a screenshot tomorrow evening of the battery life, and put it in the thread. (It's bedtime here)
Click to expand...
Click to collapse
There you go. It took a bit longer because I normally have 2 SIM-Cards active (but that uses up more battery). So the pictures are from only 1 SIM card active and mobile data always on.

jokerpappu said:
bcoz its not useful at all. its all inefficient frequency and he is right. we all tested that alot and found it to be as good as previous undercocked 300mhz freq. just test and see instead of saying this.
people dont even try and complain
Click to expand...
Click to collapse
You know what people also do? Assuming without evidence what other people did/thought, instead of asking them.
I did test and compare, and I do have a measurably better battery life than with later versions of the Kernel. I also didn't complain, I stated how it is.
Grow a thicker skin; people like you are not helpful. Not worshipping every move of a developer doesn't mean not being grateful.
I maintain that underclocking is an important feature to have, others may disagree. Some people want NFC and Wireless Charging, I could not care less.
It boggles my mind, that on XDA of all places you regularly find people that tell you what you do or don't need.

JosephusQuint said:
You know what people also do? Assuming without evidence what other people did/thought, instead of asking them.
I did test and compare, and I do have a measurably better battery life than with later versions of the Kernel. I also didn't complain, I stated how it is.
Grow a thicker skin; people like you are not helpful. Not worshipping every move of a developer doesn't mean not being grateful.
I maintain that underclocking is an important feature to have, others may disagree. Some people want NFC and Wireless Charging, I could not care less.
It boggles my mind, that on XDA of all places you regularly find people that tell you what you do or don't need.
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Click to collapse
latest test builds have better bb than older underclocked builds.
if u have had enougj acting like a idiot better use it and see the magic instead of bullshiting here. come 8n tg group and see thick head