Database Users

Does cpu frequency affects battery life?

The question is simple, the higer the freq. the more battery consumption? i am asking because i cannot see any difference from 1.4GHZ to 1.0GHZ, the battery consumption is the same under oxygen and francos kernels. i would be grateful if the experts would give us some advise or their opionion. I know it is subjective but i would like a second opinion.
Thanks alot guys

If you look with any cpu spy app, you cab see on what clock the processor is used. I mainly have it the lowest and sometimes higher. When you change the max, it should still automatically choose what clock is used, so battery should last as much as before, if not used in high clock.
Sent from my Huawei u8800 using XDA App

Invicta said:
The question is simple, the higer the freq. the more battery consumption? i am asking because i cannot see any difference from 1.4GHZ to 1.0GHZ, the battery consumption is the same under oxygen and francos kernels. i would be grateful if the experts would give us some advise or their opionion. I know it is subjective but i would like a second opinion.
Thanks alot guys
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Click to collapse
Probably not much difference, when you overclock, think the cpu voltage remains the same as it is on 800mhz... And the highest cpu freq is rarely even at use...

Invicta said:
The question is simple, the higer the freq. the more battery consumption? i am asking because i cannot see any difference from 1.4GHZ to 1.0GHZ, the battery consumption is the same under oxygen and francos kernels. i would be grateful if the experts would give us some advise or their opionion. I know it is subjective but i would like a second opinion.
Thanks alot guys
Click to expand...
Click to collapse
Well, thanks to most devoted users of U8800, we have somewhat better speed+battery life than stock also. To answer your question, yes depending on your activity the frequency have some impact, but overall shouldn't be huge in change, for example from .800 to 1.0GHz will not affect so much in daily use. However from .800 to 1.5GHz would make a somewhat huge gap difference. This doesn't mean it will drain faster if you do same activity as with .800 to 1.0GHz, for example check the watch, answer sms or few "entertainment" breaks. Only when using the phone over a longer period of time that's when you will notice the change of battery life with different frequency. Hope it clears up most hums and huhs for you. I am pretty sure some expert within this field will give a better explanation than me.
Bye~

higher freqs uses more energy, but lower uses less energy but do things slower (so energy consumption is longer). ALSO imo - if you set cpu to 1Ghz the lowest value so it always is 1ghz - it will not consume the same amount of energy if it's in idle mode - it's like your laptop - if cpu is working only in 4-7% of it's power - then the power consumption is lower no matter what freq - how do we know that? - because of heat - the more heat you get - the more energy was used. and when cpu is idle - it will not be hot.
So the answer is - if it saves then in VERY minimal amounts. But even so - i use min freq - 360mhz. it's good for me i do not get any lag so i use it.

I use the "Root System Tool Free", option CPU and I see the graphics of all clocks.
For ex. now at 245 mhz ->46%, at 368 ->10%, at 768 mhz ->18% .... and at 1612 mhz -> 1,8%, at 1804 mhz ->4,9%. Not very mutch use at 1804.
Oxygen-test-140911 + Franco.Kernel1709#1. Clock at 1804 Mhz by Menu-settings-cpu ... and smartassV2 (no profils).
The battery, I charge it all 24 hours. But I like my work... and testing things. When then will dead...I see...

ValenteL said:
I use the "Root System Tool Free", option CPU and I see the graphics of all clocks.
For ex. now at 245 mhz ->46%, at 368 ->10%, at 768 mhz ->18% .... and at 1612 mhz -> 1,8%, at 1804 mhz ->4,9%. Not very mutch use at 1804.
Oxygen-test-140911 + Franco.Kernel1709#1. Clock at 1804 Mhz by Menu-settings-cpu ... and smartassV2 (no profils).
The battery, I charge it all 24 hours. But I like my work... and testing things. When then will dead...I see...
Click to expand...
Click to collapse
cpu spy is more pretty, anyway all those apps just reads text file of cpu stat and that's it

Tommixoft said:
cpu spy is more pretty, anyway all those apps just reads text file of cpu stat and that's it
Click to expand...
Click to collapse
Thanks
But I like more the Root System Tool, because has also a Linux Console. I use it when I want make some cmd's Linux in #. I don't like the Terminal Emulator.

Well, there is a "catch" somewhere in there. The frequency does indeed affects the power consumption of the CPU and greatly at that too! But the thing is, your CPU is not the worst enemy of your battery life. Even though CPU consumes more power in higher frequencies, it still can not compete with what your screen LEDs or your GSM module or your GPS chip consumes leisurely. So, if you're looking at the overall picture -meaning if you're wondering if it will affect how long you'll be able to use your battery in your phone- the answer is, "yes but not so much". Especially if you're switching the CPU frequency based on the demand (like using smartass or on-demand governors)
Here are the thing that sucks your batteries life juice like a vampire :
Your Screen (especially background LEDs)
GSM module (talking, using GPRS/Edge/3G network communication)
GPS chip
Wireless module (this also includes Bluetooth, even though it does not consume as much as Wireless network access but everything is relative -think about playing music through A2DP headphones compared to having your wireless network active but not using it much-)
(oh yes, I love to use lots of parenthesis -and even this hyphenation thingy- )
Correct me if I'm wrong about anything by the way ..
Regards ..

I did some experiments with a msm8250 a while back and there's a graph here:
http://forum.xda-developers.com/showpost.php?p=14324649&postcount=3786
msm7x30 should be fairly similar though the graph is probably shallower since it's a smaller process size.
The CPU uses no power when it's not in use, even with the display on, the CPU is powered down completely when idle (power collapse).

SetCPU best speed

Hey everyone, just wanted to post this to see what cpu speed works best for you guys.. Im using these preset things with the program like performance or power saver etc but i dont seem to notice a difference all of them seem to be the exact same.. Wondering how to make it good for like 50% power and 50% performance, basicly balancing the 2 out as long as its better than stalk and not burning out my cpu.. so thanks, let me know what works for you guys as ive heard its slightly different for everyone else
(HTC EVO 4G)

I use the standard "ondemand" governor with a 998max-245min, but the thing I found makes the most difference are the settings under "Advanced".
I use the below "Advanced" settings along with a 245-245 screen off profile.
Seems to get me the best battery and cpu scaling.
It also helps to use an undervolting kernel like Freedom-More.
Try that for a couple days.
NOTE: click the apply button a couple of times (might be bug but they sometimes don't take on 1 button click). Try them as is without "Set on Boot", until you are sure that your phone likes them. Plus, check after a reboot that you verify/reapply them.
Sampling rate: 20000
Up Threshold: 85
Ignore nice load: 0
Powersave Bias: 14

I'm at 691200 on smartass governor with 245000 as min on Rcmix rom
Sent from my PC36100 using XDA App

ReapersDeath said:
Hey everyone, just wanted to post this to see what cpu speed works best for you guys.. Im using these preset things with the program like performance or power saver etc but i dont seem to notice a difference all of them seem to be the exact same.. Wondering how to make it good for like 50% power and 50% performance, basicly balancing the 2 out as long as its better than stalk and not burning out my cpu.. so thanks, let me know what works for you guys as ive heard its slightly different for everyone else
(HTC EVO 4G)
Click to expand...
Click to collapse
The "presets" are how the cpu scales i'd use "interactive" or "smartassv2" 245 min and max at 998+ then search around for here for various profile set-ups

I'm running the Gingerbread-Evo-Deck 1.3 with a Savaged Zen 2.2.1 CFS HAVS Kernel. I'm also undervolted 50mV, and using the interactive x governor set at 128MHz-768mhz. Running a few other simple tweaks learned from Carhauler, and I've got excellent battery life and great performance.

I currently run mine on an ICS rom & it comes standard with a tiatmat 4.1.0+ kernel & the cpu is running at about 245mhz-1036mhz with smartass governor(I usually set it to smartass v2 but it switches back to smartass haha). My battery life for me is enough to get me thru the day.

vulcan001 said:
I currently run mine on an ICS rom & it comes standard with a tiatmat 4.1.0+ kernel & the cpu is running at about 245mhz-1036mhz with smartass governor(I usually set it to smartass v2 but it switches back to smartass haha). My battery life for me is enough to get me thru the day.
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Which ICS rom are you running?

I currently running RCMix3d Runny® Sense 3.5. Should I just got with ICS to overclock or just find a kernel that allows it?

oidrtybtrd said:
I currently running RCMix3d Runny® Sense 3.5. Should I just got with ICS to overclock or just find a kernel that allows it?
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Click to collapse
Get a new kernal. Try Tiamat 4.1
I have my SetCPU at 128min 1152max smartassV2(i CAN overclock up to 1267) with 1 profile:
Screen Off 128min 245max
My battery life is extremely good.

[Q] Improve your battery life tenfold?

hi guys!!
i'm just curious.. has anyone tried this mod?? it's not for defy.. but maybe someone manaeged to make it work properly on it
thanks!!
byebye

what mod there is no link or description?? best you can do is decrease your vsel and use juicedefender on extreme.
Apart from that I doubt you will make a difference. Lowing the voltage of the CPU and juicedefender will stop all activities apart from cell service that drain the power. Dunno what more you could do without turning the phone off.

ahahaha sorry i forgot the link i'm a "lerdo" ahaahha
http://forum.xda-developers.com/showthread.php?t=1621808
this is the link!
i'm already using juice defender and i'm pretty satisfied about my defy battery life.. but i've found this thread intresting!
thanks again!

yeah could be interesting but what will it sacrifice. You get these builds by builders and if this is really the be all end all wouldnt they use it??
Like vsel you decrease the vsel you get better battery life but you sacrifice the speed of the CPU. Your CPU is faster running at a higher volt but it is using more power. So if you can run the same speed at lower volts it will use less battery.
Now this is a catch 22 as some times overclocking the cpu and undervolting it will be slower then the stock setting but you may gain more battery life.

[Q] S4 i9505 "underclock" CPU, possible?

Battery life on this phone is abysmal - on a fresh phone. Didn't restore much from titanium backup.
Would like to drop the CPU down a good 25% or so, can this be done without too much stress? It's an unbranded, rooted i9505 in Australia.
I suspect I'll need to flash something to do so, is that right?

wizzbang3 said:
Battery life on this phone is abysmal - on a fresh phone. Didn't restore much from titanium backup.
Would like to drop the CPU down a good 25% or so, can this be done without too much stress? It's an unbranded, rooted i9505 in Australia.
I suspect I'll need to flash something to do so, is that right?
Click to expand...
Click to collapse
Mines telstra stock rooted using faux kernel and my battery life is superb
Sent from my GT-I9505 using xda premium

It must be asked in Q/A Subforum buddy.

Ausboy 2011 said:
Mines telstra stock rooted using faux kernel and my battery life is superb
Sent from my GT-I9505 using xda premium
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Click to collapse
Define "superb" for me.

Apologies for jumping in here. Can you define abysmal too? I would say my battery life is more than double my S2 (that was Cyanogen niggtlies but this is currently djembey's slim). Biggest drain is usually the 3G but I have that off most of the time. It is hard to compare to be fair as we will all use different settings but I have a lot of the bloat removed or disabled, power save on and screen at half brightness. How is yours setup as maybe we can shyc settings a little to compare more closely.

Ausboy 2011 said:
Mines telstra stock rooted using faux kernel and my battery life is superb
Sent from my GT-I9505 using xda premium
Click to expand...
Click to collapse
If the reason to underclock is to save more juice, you should understand that the phone doesn't work on 1,9ghz most of the time, on average it's 200-800mhz depending on task, so you would not probably win a lot battery if you underclock let's say to 1.7 unless you're a heavy gamer.
Sent from my GT-I9300 using xda premium

beeboss said:
If the reason to underclock is to save more juice, you should understand that the phone doesn't work on 1,9ghz most of the time, on average it's 200-800mhz depending on task, so you would not probably win a lot battery if you underclock let's say to 1.7 unless you're a heavy gamer.
Sent from my GT-I9300 using xda premium
Click to expand...
Click to collapse
I know this tread is already pretty old, but that answer is only partially true.
On stock configuration the GS4 uses the 'ondemand' cpu gouvernor. That gouvernor ramps up the cpu speed to the max when cpu activity is detected and will then slow down the cpu depending on the task. So everytime you open/close an app the cpu is running at 1.9ghz. (At least that I heard/experienced) using a custom kernel you can choose a different gouvernor which is more battery friendly, or lower the max cpu speed(from 1.9 To for example 1.7ghz). You can also lower the min cpu speed so that when the device is idle, it will consume less power (I think standard is around 350mhz and I put mine on 189). Some kernels even allow to underclock the GPU. Undervolting will also save battery.
In short: using a custom kernel you can really save some battery, increase performance, or get a better balance between the two, but you will have to take the time to find the settings that work best for you. I personally use KT kernel, with an overclocked CPU and GPU, but I also undervolted them both by 75mV, and with some tweaking with settings for when the screen is turned off, my battery lasts longer than stock configuration.
Correct me if I'm wrong on something, I'm not a Cpu expert
And sorry for bad english

wizzbang3 said:
Battery life on this phone is abysmal - on a fresh phone. Didn't restore much from titanium backup.
Would like to drop the CPU down a good 25% or so, can this be done without too much stress? It's an unbranded, rooted i9505 in Australia.
I suspect I'll need to flash something to do so, is that right?
Click to expand...
Click to collapse
Check this out, if you long press the power saving icon in the notification pull down, it will bring the settings for it, Uncheck all but the cpu. It will run no higher than about 1.3 ghz and is plenty fast for all tasks. I use that setting on the s4 and note 3. I never ran into any lag except TouchWhiz home launcher but I use Nova Launcher anyways.
You will see a better battery life as well.

Htc 820 Undervolt and Overclock?

Hello, is undervolting and overclocking possible on htc 820u? I did not find any threads about it. Unfortunately setCpu app does not seem to be working and i tried many similar apps. Anyone has an idea about it? I wanted to undervolt my device to minimise battery consumption.
Details:
htc 820u
lollipop
rooted
bootloader unlocked

For this you need a custom kernel.

Okay thanks for your reply. are there any custom kernel for the htc 820u? and will it get in the way if i get updates for my phone later? i mean if i will have to look for a stock kernel to be able to do updates ect..

Vivacity said:
Hello, is undervolting and overclocking possible on htc 820u? I did not find any threads about it. Unfortunately setCpu app does not seem to be working and i tried many similar apps. Anyone has an idea about it? I wanted to undervolt my device to minimise battery consumption.
Details:
htc 820u
lollipop
rooted
bootloader unlocked
Click to expand...
Click to collapse
HTC has an inbuilt power applet for this device which actually does the cpu scalling. Use EXT Saver from Power settings, it will lower your cpu core and speed.
Overclocking: this device already fast enough. Overclocking will increase battery consumption and heat.

tomal said:
HTC has an inbuilt power applet for this device which actually does the cpu scalling. Use EXT Saver from Power settings, it will lower your cpu core and speed.
Overclocking: this device already fast enough. Overclocking will increase battery consumption and heat.
Click to expand...
Click to collapse
yess definitely it is fast enough. i used the EXT saver but i just wanted a little more tweaks. Like setting maximum and minimum cpu power. what do you think about it?