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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Related
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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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
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
Sent from my Nexus 4 using xda app-developers app
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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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So I have a very thought out question now I have a 4 core phone right? Well my battery life is below average and I was wondering if I had all my cores running at once would it balance out battery life? I just need some help from someone who knows about all this and are all cores mandatory?
Sent From My Liberated E970
You can select how many active cores are activated with trickster mod and (necessary!) a kernel that supports this.
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I know how to and can with my kernel but I need to know if more cores are activated if the battery life will be better or worse
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I would definitely take a look in to what my batter usage is and how to control that before I worry about the cores. Just my two cents.
P.S. I am sorry but I believe the Multi-core in the title is spelled wrong.
mr turtle droid said:
I know how to and can with my kernel but I need to know if more cores are activated if the battery life will be better or worse
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More cores active would mean more processing power, and more processing power requires more energy(atleast on the same cpu), so disabling most of your cores would result in better battery life, maybe by a little bit though.
Hahaha I didn't realize it said mulit
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useful topic
It seems to me that by disabling cores wont make a difference to your battery life, only to your performance. It doesn't matter if 2 cores work for 5 seconds or 1 core works for 10 seconds, it is practically the same power consumption
Play around
I would say download CPU-Z from the Play Store and look how much Cores are active and which clock they're at.
Then flash a custom Kernel, which lets you control the clock, govenor and how much cores are active, undervolting may increase your battery life too.
Play with the settings (PLEASE DO NOT RAMP UP THE CLOCKS or set the voltage to the lowest point you can, it may break your phone, stay reasonable, it's not my fault if your phone bricks) and look what's best for you.
Pro Tip: Take a look at the different govenors and look what they do. Google them!
Greetz Leevee33
I hope I could help you a little
Im using trickster mod and I know about all of this I studied up and have undervolted by 200 MV stable but I'm using the hotplug settings to 1:2 so not all 4 cores are active and I get almost two days on one charge!so I guess that does mean less cores use less power
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Just curious what everybody is setting their cpu minimum frequencies at. I am not too concerned with battery life so I was thinking of setting mine a little higher to keep everything as smooth as possible. Is there a risk to raising the minimum frequency?
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pwshadow said:
Just curious what everybody is setting their cpu minimum frequencies at. I am not too concerned with battery life so I was thinking of setting mine a little higher to keep everything as smooth as possible. Is there a risk to raising the minimum frequency?
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I think you would benefit more from choosing another governor instead Try intellidemand or interactive := Both of these should be better than ondemand
pwshadow said:
Just curious what everybody is setting their cpu minimum frequencies at. I am not too concerned with battery life so I was thinking of setting mine a little higher to keep everything as smooth as possible. Is there a risk to raising the minimum frequency?
Sent from my VS980 4G using xda app-developers app
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i have mine set at 300000 so when my phone goes into deep sleep it's using little cpu power, but i also have interactive governor so that when i turn the screen on there's no delay and the kernel and cpu have what they need to be snappy.
this thread tells you all you need to know about governors and i/o schedulers.
http://forum.xda-developers.com/showthread.php?t=1663809