any help????
my wife's battery life is so bad
I use set cpu and turn down the speed when the screen is off. My battery performance is almost equal to what I used to get from the Droid1. It'll last me all day with moderate usage,
I use SetCPU as well but I am a little more aggressive.
ScreenOff = 300Mhz
Less than 50% Batt = 800Mhz
Less than 25% Batt = 600 Mhz
I also have it set to throttle down to 800Mhz when temp goes above 50C but thats not really about Battery Life.
You really don't notice the lowered CPU at all. Especially during phone calls or TXTing.
I think the real savings is in the screen off. My guess is the stock automatic scaling is not doing a good enough job on it's own when the phone is sleeping. and most of our battery life was being blown away in standby.
With those settings I have been able to go almost a day and a half on a charge with moderate use where before even light use would only get me 6-8 hours.
And that is with a BP6 not a 7!
With those settings as your battery goes lower the longer it will take to drain. It really was remarkable.
Computer Dreams said:
any help????
my wife's battery life is so bad
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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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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
hey
i start webbing the net and set the brightness to half sun [30% or 40%]
and got that leakage
2% of battery for one min of webbing very high
i played a bit with the brightness and it went down
i test it at power saving gov'
0% bright = 150 mA
100% bright = 350mA
very abnormal no ?
here pics with battery drain
edit:
using global FW
suil's sense4.1 rom
the transistor of the screen is not functional well ?
350 mA is pretty low actually, although I measure with Battery Monitor Widget by 3c.
Can you get GSAM Battery Monitor and post the results?
Sent from my HTC Rezound using Tapatalk 2
thx for reply i did the same test now
and still got 2% for min even on 0% bright
It's not screen, it's CPU using much current. Flash custom kernel and limit cpu max freq. and you will see much better battery life. I managed to have 6hrs of display on time while reading with same rom and funky kernel and cpu set to 500Mhz max in airplane mode
Just want to know everyones opinion on if it can really save life for the S4. Cause the way I see it is if the cpu is constantly being clocked down/up for instance, when my screen is off I have it so that cpu is at about 400mhz and when the screen comes on it boosts back up to anywhere between 1200 and max
If you're driving, and you slow when down to say 30mph and slam on the gas to get up to 100mph instead of steadily getting there, you're going to use a lot more gas. So if it is the same with the phone, aren't I using more battery life than saving?
Markymarc206 said:
Just want to know everyones opinion on if it can really save life for the S4. Cause the way I see it is if the cpu is constantly being clocked down/up for instance, when my screen is off I have it so that cpu is at about 400mhz and when the screen comes on it boosts back up to anywhere between 1200 and max
If you're driving, and you slow when down to say 30mph and slam on the gas to get up to 100mph instead of steadily getting there, you're going to use a lot more gas. So if it is the same with the phone, aren't I using more battery life than saving?
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I'm not entirely sure, but with your example, doesn't that depend how long you're going 30 or how long your screen is off at a crack? If you turn on your screen for 10 minutes for every 20 it's off, I think it would save your battery more in the long run.
You use more gas in the car analogy as you have to overcome a ton or so of mass driving at 30 mph. Changing clock speeds faces no such resistance, so it won't be the same with the phone.
yes, the acceleration doesn't really affect the drain. the fact you're running at a higher clock speed is the drain. you can adjust your steps and max speed, thus saving a little bit of battery. undervolting can help to, but the cpu usually draws so little power that the savings may go unnoticed.
Hi Guys,
Is there any method for setting Governor settings on the Truesmart?
I want a deeper sleep, Come the end of my day I've got through on a single charge with 35% to spare but still think I can do better.
Cell Standby is taking 41% and Phone Idle 37%
Standby a bit of baseband tuning "may" help but not much can be done. But for Cell standby I'm going to need to get a more battery friendly governor setting, maybe being a little lower frequency in sleep mode and less eager to ramp up to full speed for every request. For a watch this size it is zippy enough, a small knock to performance won't hurt.
So any ideas?
Thanks