At night my galaxy s4 battery goes down by 70% in about 6 hrs. Why is that? How to improve the battery?
I am using set cpu to set a night profile where the cpu speed is 250-500 mhz governer ondemand and I/o deadline. How to improve the battery?
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Check the battery subsection in your settings, it'll tell you what is using all the battery
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Hello guys,
I'm here to ask for all of your opinions about the cpu Profiles, frequencies and governor.
For screen on I'm currently using 1200mHz on performance, I would like to know if it would save more battery by using on demand governor.
Some months ago I had a discussion with few xda members about this subject. But that was on aurora v4. Now I'm currently on v5 u17. Let me know your opinion. Thanks
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To be honest, I've never experienced any benefits of setting cpu profiles for screen on, screen off etc. Your phone will work much more smoothly if you stick as close to the defaults as possible.
I don't use profiles. My min is 245 and max 1200, using on demand governor.
For a while I experimented with profiles, and had bad lag when unlocking the phone, and terrible battery use when screen on.
Independent of profiles, your governor will put your phone into deep sleep when the screen is off anyway.
Do a search for "race to idle" this explains in more detail the benefits of using ondemand as opposed to other governors in terms of battery use etc.
IMHO, Android as a platform would be far better served if people stuck close to the default settings and cpu profiles. Most of the time, any negligible benefits are just placebo.
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So according to the race to idle running with performance governor saves battery
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In theory yes, but if your cpu is always running at max frequency, ie even when doing nothing, then no.
I have done tests, and my battery always lasts longer using ondemand as opposed to performance, or other governors.
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Use interactive/bfq that's the best in my opinion
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Is it ok for me to have a task in Tasker that changes the governor everytime the phone sleeps and wakes? Is that harmful to my device?
not sure about if it's dangerous or not but I am curious a to why you would want to... sleep is sleep not much of anything happening to warrant a change
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QUIETLYloud said:
not sure about if it's dangerous or not but I am curious a to why you would want to... sleep is sleep not much of anything happening to warrant a change
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Well, I've found that my battery lasts a lot longer when the powersave governor is on, even while in sleep. When the screen is on I have it change to ondemand so i get a nice smooth UI. When in sleep with ondemand on, it drains faster than when I have powersave on and have it clocked to 288000 MHz.
Brendan12695 said:
Well, I've found that my battery lasts a lot longer when the powersave governor is on, even while in sleep. When the screen is on I have it change to ondemand so i get a nice smooth UI. When in sleep with ondemand on, it drains faster than when I have powersave on and have it clocked to 288000 MHz.
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You have it clocked at 28.8 GHz? Pretty sure you're going to melt your phone. (I kid)
I believe he meant 288 GHz. He's from the future and is trolling us.
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Branden pls
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Totally fine, but you might encounter stability problems.
Lol. My bad, was just copying what Trickster Mod said.. :/ I have the min at 288 MHz so when power save is on it underclocks to that.
I just don't want to screw up the hardware by jumping back and forth between ondemand and powersave.
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Try out this Tasker script : http://forum.xda-developers.com/showthread.php?t=1018245
I have been using SmartassH3.
What is a good governor that can potentially save battery life?
I like to have it so when the screen is off it is using the least battery as possible.
When it is on I'm not draining battery (like if I'm only using facebook for example) it shouldn't go to the max setting.
Here are my setting
162MHz and 1998MHz
Kernal 3.4.49 AGAT Gs3 v0.3.3+ on MF9
Thanks for the input
As a new s4 owner im wondering thr same thing.
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I've seen a few post on how to undervolt but I'm still not 100% sure how or if I should, I'm guessing it gives a little bit more battery life ? Also what app would be the best to use ? And the best values to apply
ROM: MAKO-JB-MR2
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ryanraven said:
I've seen a few post on how to undervolt but I'm still not 100% sure how or if I should, I'm guessing it gives a little bit more battery life ? Also what app would be the best to use ? And the best values to apply
ROM: MAKO-JB-MR2
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you have to install custom kernel for undervolting.. and it does not give you battery life..it reduces how hot your phone gets..
It can increase battery life actually, not hugely but ARM processors used in phones use a few watts, wattage is calculated as voltage * amperage, less volts going through the lower the wattage, ergo lower power consumption resulting in extended battery life. /rant
OP you will need a kernel that supports UV (pretty much all non stock) and a UV interface, I prefer trickster mod. Look for core voltage and knock it down a step (-25mV). Then stress test / benchmark, if you don't freeze / reboot then you can knock another 25mV off, keep doing this until you get the minimum voltage your phone remains stable (for me 1025mV @ 1.5GHz). You can then set for the options to stick on boot.
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If anyone is using lower freq and/or undervolt, does it noticeably save battery?
If so, what freq and/or undervolt are you using.
Or if you have any other tips to save battery, would be much appreciated
Serris said:
If anyone is using lower freq and/or undervolt, does it noticeably save battery?
If so, what freq and/or undervolt are you using.
Or if you have any other tips to save battery, would be much appreciated
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They will have a slight effect on battery life, but not a huge one. It's almost not worth it.
Undervolting has small increase in battery. Main benefit of Undervolting is that it reduces the amount of heat generated.
Underclocking will also reduce heat but can actually decrease your battery life because it takes longer to perform tasks.
At idle speeds your phone is very efficient at saving power so by lowering the clock speed it takes longer with tasks and subsequently spends less time at idle where it's better at saving power
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Alex240188 said:
Undervolting has small increase in battery. Main benefit of Undervolting is that it reduces the amount of heat generated.
Underclocking will also reduce heat but can actually decrease your battery life because it takes longer to perform tasks.
At idle speeds your phone is very efficient at saving power so by lowering the clock speed it takes longer with tasks and subsequently spends less time at idle where it's better at saving power
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By how much is it safe to undervolt?
Serris said:
By how much is it safe to undervolt?
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If the phone froze up or reboot its too much.
-100mv on all frequencies is usually fine for majority.
Note that some kernels will already be running at -100mv though
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I run faux and UV at -100 never tried to go lower
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