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I've install Rom Toolbox,
and i saw there is a "CPU slider" where i control the clock speed.
i've put it to 1000MHz instead of 1200MHz and tested it for several days
i really dont feel any difference in performance.
browsing seems same, games like asphalt is equally smooth.
heating is similar, equally warm.
the only difference is quadrant benchmark.
1200MHz scores 3200-3400
1000MHz scores 2600-2900
frankly speaking, i'm not sure if there's any difference in battery life.
is there any way to accurately test whether the clock speed affects the battery life?
i've seen other threads, where there are very different opinions.
some say it will improve battery life, and some say its worst.
http://forum.xda-developers.com/showthread.php?t=726019
Quote: (SetCPU doesn't make a difference in battery life, it can only shorten it. The kernal already has the best settings for CPU speed built in.)
http://forum.xda-developers.com/showthread.php?t=1305465
Quote: (if you are able to stand the side effects of underclocking, it will surely boost your batery life.)
On my SGS2 program called CpuSpy shows that 1200MHz is about 1% of total cpu time (remember that governor is ondemand and CPU is at 1200 only when need it). If power consumption is directly proportional to clock speed by limiting it to 1000MHz you will get about 20% less power usage by 1% of time... looks like 0.2% power saved ? Soo if Your phone works for about 48h on one charging this way You can get about 6 extra minutes. It's just my guess...
Also have to consider if slower cpu causes screen to eat power for longer time... (because You have to wait longer for operation to complete)
slig said:
On my SGS2 program called CpuSpy shows that 1200MHz is about 1% of total cpu time (remember that governor is ondemand and CPU is at 1200 only when need it).
If power consumption is directly proportional to clock speed by limiting it to 1000MHz you will get about 20% less power usage by 1% of time... looks like 0.2% power saved ? Soo if Your phone works for about 48h on one charging this way You can get about 6 extra minutes. It's just my guess...
Also have to consider if slower cpu causes screen to eat power for longer time... (because You have to wait longer for operation to complete)
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HI, thanks for replying. I understand what you mean. the phone dont operate at 1200MHz all the time. but when using browser, and playing games, such as asphalt, it runs at max CPU usage almost the entire gaming duration.
Anyway.....
the real question is whether the clock speed is directly proportional to the battery consumption.
while reading your post, i thought of a brilliant ideal how to verify this.
the CPU slider not only allows you to set the max CPU speed,
you can set the min CPU speed as well.
So, i thought of an experiment, lets set the min & max CPU to 1200MHz,
this way, the phone will be running constantly at max CPU even when its idle.
let the phone be turn on till it run out of battery, record the time, T1.
then repeat again with max and min CPU set to 1000MHz.
record the time it is turn on till it run out of battery, record time as T2,
then compare T1 & T2, this could certainly work.
it would be nice if any member here happens to have 2 sgs2, and tried them ;-)
There are two more things to consider
1. CPU is not the only element that consumes power.
2. SGS2's Exynos is always clocked at 200MHz when the screen is off - check if this minimum slider affects that too.
Please let know how your experiment goes.
Regards
when the screen is off, the phone will be in "deep sleep" state. i think thats less than 200MHz.
anyway, i wont be doin this experiment any time soon.
you see, this is my only phone, i need to use it.
i dont have much oportunity to leave it and wait for it to run out of juice.
still, i'll try it when i have the chance.
sometimes battery percentage always stuck at one point for example at 65% or 85% and not moving when charging(phone on) if i restart it and suddenly it goes up to 99% is that from rom or need battery calibrated? or does my battery is damaged?
how long your battery last when playing 3D game or wifi browsing on airplane mode and every radio turned off + brightness on 5%?
already undervolt at minimum in dodova kernel with max speed at 1.2 ghz but the phone still get warm when playing 3D game near the camera,if i underclock it at 1ghz or maybe 800mhz will it save significant battery and reduce heat?
amdultra said:
sometimes battery percentage always stuck at one point for example at 65% or 85% and not moving when charging(phone on) if i restart it and suddenly it goes up to 99% is that from rom or need battery calibrated? or does my battery is damaged?
how long your battery last when playing 3D game or wifi browsing on airplane mode and every radio turned off + brightness on 5%?
already undervolt at minimum in dodova kernel with max speed at 1.2 ghz but the phone still get warm when playing 3D game near the camera,if i underclock it at 1ghz or maybe 800mhz will it save significant battery and reduce heat?
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Click to collapse
Dude, first of all, I'd suggest to stay away from under volting anything as it severely affects performance and life span of the hardware. It needs a lot of testing to get it correct, else it simply damages the hardware. Yes you may get more battery life but it wouldn't be a huge difference as per stock.
As per your first problem, simply calibrate your battery using battery calibrator from the market. Do this with defaults volt values.
As for 3d games, yes mine too gets hot but that is due to the gpu as well, so underclocking only the cpu won't help. And if you underclock both of them, then it will affect gameplay.
My phone lasts for at least four hours with mobile network on, but that is because I am using a 3460mah battery, not the default one.
thank you for answering
i just want to play 3D game above 2 hour more i will calibrate my battery and trying to underclock than undervolt it to 1 ghz , on 1.2 ghz is still play gta 3 all max with smooth framerate
As the title says, is it really worth? I mean, should i decrease my phone maximum clock speed of the cpu by, like, 100-200 mhz in order to notice less battery consumption?
thanks
You can decrease the cpu clock speed for better battery life. But don't decrease to 100-200 mhz. It can cause constant random reboots and make your device very unstable.
Really? I'm using my s3 neo with a clockspeed of 1.3 ghz instead of 1.4, and i'm rarely noticing strange things
For few days I will not have access charging my battery. I am thinking about disabling cores and lowering maximum cpu frequency for better battery life. I have root and carbon rom. Is it efficient disabling cores and make one core at %100, or 4 cores at lower use percentage? And what are my other options to save battery? I don't care much performance. I don't mind slowing down. I wish I could test myself but I don't have time to test.
Daily I use 3 cores at 1036MHz without excessive lags. I'm using SetCPU to do it. It's possible to create profiles and set frequency, governor and scheduler when a specific app is launched, when battery reaches into a low level, when screen is On/Off, etc.
Screen time about 7,5 hours.
For gaming I need to change it, of course.
I'm using Abricot kernel.
On snapdragon 665, and 710 I felt cpu throttled on battery percentage of 10% even on custom from, Any ideas?
ht#ps://forum.xda-developers.com/nexus-6/general/mod-disable-throttling-battery-low-t3440814
Tried that guide, no results, any help?
I am currently making thermods so I am asking as how it should be fixed? or can it?