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[TIP]Underclock your TI OMAP 850 based device (100% CPU Utilization workaround)

I own a ASUS P320 (Galaxy Mini) which is notoriously infamous for its battery life. Therefore I was looking for a way to underclock the processor to squeeze out a few more hours of its battery. I wanted to autoscale the CPU Speed as and when required.
OMAPScaler did not work though it was able to set the processor speed to the desired value, so did OMAPClock, but the CPU scaling functions did not work. Neither did Homescreen PlusPlus. The reason I found out that my CPU always reports a 99.8% to 100% usage thus these utilities always set it to the highest speed I had configured (201 MHz for my device).
It was then, while using Chi Tai's awesome Homescreen PlusPlus Advanced version that I found this registry setting which enables an alternative method of CPU Load calculation.
Code:
Create a DWORD called UseIdleLoop of value 1 under \HKLM\SOFTWARE\Microsoft\Today\Items\Homescreen PlusPlus. Reboot/Reset your device.
The CPUScaler function started working after that Also the "Get Original CPU Speed" function does not work. You can manually save it and click on OK to save it.
My CPU Scaler settings :
Min : 117 MHz
Orig: 143 MHz
Max: 201 Mhz
No Boost. CPULoad Threshold : Low 30%, High 80%. All other settings default.
Works fine with my ASUS 320. Will report on battery life in a couple of days.
Thanks to timmymarsh who helped me a lot with my questions via PM on this thread : http://forum.xda-developers.com/showthread.php?t=549145
abesh

Idle CPU Usage High

My HD2 is running at around 20% CPU usage when idle according to BATTClock. This is even after a hard reset with just Batclock installed, no radios on, and HTC Sense shutdown (just on old Windows today screen). Is this normal? No wonder the battery life is so short.
My Touch Pro generally shows 1-2% CPU usage when idle even with phone and push email on.
Task manager doesn't show any processes or application using that amount of CPU. Is it just Battclock that is wrong or is something else going on? I have turned off all location services.
Nick

Interesting fact. Needs more research though...

I've tried everything I can think of, including switching off automatic backlight sensing, location settings, etc. and Battclock still shows around 20% with nothing running. Any ideas for a more sophisticated tool to monitor the CPU? Does anyone else with Battclock installed notice this?

And if battclokck use 20% of cpu ?

dorigny said:
And if battclokck use 20% of cpu ?
Click to expand...
Click to collapse
BattClock itself does use almost no CPU. But HD2 has the ability to lower the CPU speed. I use a Microsoft API to get the idle percentage. Apparently this Microsoft API does not correct for the CPU frequence change?
You can check with a Task Manager, which process consume how much CPU, like FdcSoft TaskMgr. Then you can also check if BattClock is wrong.
I am planning to add another method for measuring the CPU spent, so for now you can better first check if BattClock is right or not. I have a Touch Diamond and there the CPU percentage is reported the same as the Task Manager.

WEll, mine is 56% atm and i have no idea why.
the only reason i can think of is g-alarm and messenger live

On a device that changes the CPU clock to meet demands, CPU percentage means nothing if you don't have a way to know at the same time what the current clock is.
And yes, Battclock itself might not use a lot of CPU, but it seems its way to draw itself on top of the menu bar is not very efficient. A bit flaky, the redraws are not clean, and I wouldn't be surprised if the system calls it uses do use a lot of CPU.

kilrah said:
On a device that changes the CPU clock to meet demands, CPU percentage means nothing if you don't have a way to know at the same time what the current clock is.
And yes, Battclock itself might not use a lot of CPU, but it seems its way to draw itself on top of the menu bar is not very efficient. A bit flaky, the redraws are not clean, and I wouldn't be surprised if the system calls it uses do use a lot of CPU.
Click to expand...
Click to collapse
Mmmm....I wonder what you're basing your comments on. Are you saying that ZuinigeRijder is lying?

kenkiller said:
Mmmm....I wonder what you're basing your comments on. Are you saying that ZuinigeRijder is lying?
Click to expand...
Click to collapse
The Qualcomm CPU, the one the HD2 has, reduces it's clock speed when it is not needed to run at full capacity to save battery life.
i.e. If the CPU is running at 1Ghz, and a program is using 1%, it will drop the clock speed (due to lack of activity). Say it then drops to 100Mhz, it will then be running at 10% of the CPU clock speed.

A simple way to check wether battclock influences the readings somehow (which I don't really believe) would be to turn it off and check, as zuinigerijder said, with fdcsoft advanced taskmanager.
BTW I also get ~20% usage when idle, in some manila interfaces I get to lowest values of 7%, but then back to ~15% and then again ~20%
No way to know the current clock of the cpu?

rp-x1 said:
The Qualcomm CPU, the one the HD2 has, reduces it's clock speed when it is not needed to run at full capacity to save battery life.
i.e. If the CPU is running at 1Ghz, and a program is using 1%, it will drop the clock speed (due to lack of activity). Say it then drops to 100Mhz, it will then be running at 10% of the CPU clock speed.
Click to expand...
Click to collapse
I think you've hit the nail on the head. When I start a new program the CPU% drops briefly to 1-2% before climbing again. I guess this is the device ramping the processor back up before launching the program, hence dropping idle usage from 10-20% of say 100Mhzto 1-2% of 1000MHz.
Cheers
Nick

Extract ,power settings, from omnia 2,is it possible?Put it on htc hd2,in cab format,regulate the speed on the CPU and save the battery life?Anyone?

Legend and SetCPU? (min and max frequency you can achieve?)

Hi all,
Has anyone tried using SetCPU on his rooted legend? I tried on my non rooted one just too have a look at the CPU frequencies, to see how it behaves at idle and so, and while max is 600MHz the min is "only" 480MHz.
Doesn't that sound a bit high for the min frequency? The snapdragon is clocked at 1GHz and idle is 250Mhz. Has anyone tried lowering the idle frequency on the legend to gain some battery life?

Hi Bricolo_fr,
I found this entry in the FAQ of SetCPU documentation fount here (http://www.pokedev.com/setcpu/):
"Why aren't there more speeds to choose from?
The speeds which the CPU can run at is in part a kernel limitation and in part a hardware limitation. Attempting to set the CPU frequency to anything else won't cause any changes in CPU speed. On some devices, the kernel can be modified to enable certain other frequencies. There are other speeds that would be useful, the capabilities of the processor itself often hinders which frequencies are available on a device."

Anybody has the skills for making a kernel change?or some ideas for us being able to use this properly?

Hi,
Today I rooted my legend and tested again SetCPU. At the begining, it was only possible to set CPU from 480 to 600 mhz, but then I red this in SetCPU documentation:
http://www.pokedev.com/setcpu/
--------------
10. Disabling Perflock
On most stock HTC kernels and some custom kernels, HTC has enabled a driver called "perflock" that constantly resets SetCPU's Max and Min settings. This does not apply to mostly "Google experience" HTC devices such as the T-Mobile G1, the myTouch 3G, any Google development device, or the Nexus One. It does, however, apply to "HTC Sense" devices such as the HTC Hero, Droid Eris, HTC Desire, HTC Incredible, EVO 4G, and myTouch Slide. Non-HTC devices never have perflock enabled.
SetCPU can disable perflock on newer HTC kernels, giving you control of the Max and Min settings of the CPU. To do this, press the Menu button on your device in the Main tab and choose "Disable Perflock." Read through the notice and then press the button in the dialog. If successful, you should be able to change the frequency with SetCPU. If this process fails, please e-mail the developer with your kernel version and device so support can be added.
Keep in mind that disabling perflock does not enable overclocking, though some overclocked kernels may require perflock to be disabled. Overclocking, in most cases, requires a custom kernel.
-------------------
So, in the last version of SetCPU there is an option in the menu called "Perflock Disabler" With this option, it is possible to select the minimun frequence to any value from 0 to 600 Mhz.
I have not been able to modify maximun to a value higher than 600 mhz (overclock) but I think the best target is to reduce battery consumtion decresing the minimun mhz value. Actualy I set minimum 128, maximun 600.

so, are you sure you could set it to the minimum of 128? because i think it doesn't work actually...at least without a modified kernel

I got a min at 19 MHz. to 600 Mhz.

casca said:
so, are you sure you could set it to the minimum of 128? because i think it doesn't work actually...at least without a modified kernel
Click to expand...
Click to collapse
Yes. Also confirmed with the app Os Monitor:
-Saling range: 122880-600000
-Frequency range:19200-600000
-Governor: ondemand
-Current: 122880
Software version: unbranded 1.31.405.4 (just rooted with Monodaco method and applyed all OTA updates)
In SetCPU Info:
-Time in state:
19200: 22
122880: 1169071 (Currently I set minimum at 122880)
128000: 0
245760: 269491
480000: 362472
600000: 347583
SetCPU in Legend allows the following governors: userspace, ondemand, and perfromance. Ondemand works fine. Userspace and performance makes extrage things (i tested quickly, to be honest)
I defined several profiles in SetCPU, depending of battery chage, and seems to work fine. But, I did not enable "Set on boot" option in SetCPU and need to activate "Perflock Disabler" in SetcPU menu everytime I reboot Legend (I prefer to test a SetCPU a few days before enabling "Set on boot")

well...this is nice... after disabling the "perflock" option...
I set the minimum value to 19mhz....lol... with "ondemand" management of the cpu...
I think I'have seen a HUGE improvement of the battery...When I mean HUGE, I really mean HUUUUUGE!
Like, for a 12hours use always with 3g data on,and 2 hours of wireless...lost only 30% of battery...
Testing today for more results...

I use the profile manager in SetCpu to set the CPU to 128-256 while screen off, max mhz while charging, etc.
I have seen big improvements.

Yes, battery improvement is very nice. This solution is great.
I am testing a profile to 122-245 while usb charging. So, when I use Googla Mobile Navigation it is able to load a bit battery while using GPS (normaly drains battery a bit while charging)

out of charge at 6am...it's now 10am...3g ON...wireless ON now for 2hours...
So, in resume, on 4 hours of use the battery loss - 6%
At this rate, and with these settings it should last for about 66hours, about 2,7 days.
Let's see...

casca said:
out of charge at 6am...it's now 10am...3g ON...wireless ON now for 2hours...
So, in resume, on 4 hours of use the battery loss - 6%
At this rate, and with these settings it should last for about 66hours, about 2,7 days.
Let's see...
Click to expand...
Click to collapse
Holy crap!!Yea, that would definately make me root!
Sent from my HTC Legend using XDA App

I can only say...in 3g mode and with the wireless ON 90% of the time from 6am to 00.00, i had more than 40% battery left at 00.00 when i went to bed.For me it's a new record.
Sent from my HTC Legend using XDA App

In my case, tested yesterday:
Battery consumption:
battery at 100% at 10:00 am. 3g data on 1 minute every 15 minutes (JuiceDefender), 30 mínutes call and 8 emails received and red a long de day. Battery was at 41% at 1:00 am. I spent the day in a place with low 3g network (between 1 and 2 bars in the top right corner)
SetCPU Configuration:
-Profile 1: when battery is between 50% and 100%: min 122 mhz, max 600 mhz
-Profile 2: when battery is between 30% and 50%: min 122 mhz, max 480 mhz
-Profile 3: when battery is between 0% and 30%: min 122 mhz, max 245 mhz
So, battery save is very nice.

this is soooooo interesting....
I couldnt find the app in the market...i found the apk in the HTc Dream forum...version 2.01 by coolbho. Is it ok to use that ?

i think so...
in worst scenario...it won't run lol...(i think!)

If i use linpack i can see someone with a legend that runs on 711mhz? Am i missing something can we overclock..
Sent from my HTC Legend using XDA App

I've made some profiles too, and it's working really well.
Are you guys using the auto detection of the device? I've used it in the first time, but it detected my device as a Hero(?) since the max frequency was only 528mhz. Then I've changed the device and selected MSM7x27 manually and got the 600mhz max and many middle frequencies like 120, 122 and 128mhz. Now I've changed the device again to auto detection and it worked this time, got the 600mhz max, but less middle frequencies (no 120 or 400mhz). Also, i'm using 122mhz as the minimum frequency in all profiles, isn't 19mhz too low? Or the demand feature really works that well and I will not even notice any difference?

wasup!
19mhz is not too low, i've used it and had a huge increase in battery life.
I am using profiles also at the moment.
Regards

Learners Lisence said:
this is soooooo interesting....
I couldnt find the app in the market...i found the apk in the HTc Dream forum...version 2.01 by coolbho. Is it ok to use that ?
Click to expand...
Click to collapse
Hi,
You can download from this link:
http://forum.xda-developers.com/showthread.php?t=505419
If you like the app, you can donate getting from Maket. Look for "setcpu for root users". It is only 1.99 USD.

If you're using setcpu, try these profiles.

1. Dont set any of them higher then 1075. I've found that on multiple HD2's that higher then that causes instability because the chip doesnt like to be pushed that hard.
2. I have my primary profile set to 1075 max, 614 min, and getting good results.
3. Set your primary to interactive, and all profiles to interactive EXCEPT your low batter profile.
4. Add these profiles:
Temp >
Charging/Full
Batt < then
Screen off
-Temp > Set the temp around 40 degrees C. Set to interactive. Max around 576, min to 245. Reccommend auduable warning on. Priority to 100%
-Battery <. Reccomend you set to around 30% battery. Powersave mode, max around 576 or so, min at 245. Priority at 90%
-Charging/Full Max to 1075, min to somewhere in the 500 or 600's, or higher if you want. Interactive, and Priority at 80%
-Screen off. Set max to 576, min to between 300-450. DO NOT set min to 245, as this may cause a screen freeze when it tries to wake up. Interactive, and priority to 50%
Thus far, this combination of settings has, on the multiple devices i've been playing with (about 6 total at the moment) is giving the best battery life, and the least amount of screen freezes on wake up.

Thanks for sharing these. AFAIK setCPU is quite important to the stable and productive (sans improved battery life) of Android on our beloved's.
Personally, I've taken to 245/245 for sleep mode. I haven't noticed a "groggy" wakening, but maybe I'm alone here...otherwise I like your settings.
Thanks again for taking the time to post.

android can run perfectly at 650+ mhz max, 245 min

audscott said:
Thanks for sharing these. AFAIK setCPU is quite important to the stable and productive (sans improved battery life) of Android on our beloved's.
Personally, I've taken to 245/245 for sleep mode. I haven't noticed a "groggy" wakening, but maybe I'm alone here...otherwise I like your settings.
Thanks again for taking the time to post.
Click to expand...
Click to collapse
I used to use 245/245 on sleep, but noticed a 4-5 second delay on one of the devices.
Actually, that may have to do with your SD card itself. my phone (running Bangsters 1.3b build) has a rare delay on awake, and a class 4 card.
Another HD2 running darkstone has a consistant delay, 245/245 and its running a class 6.
And still another has no delay, and is set to 245/245 but the stock non-speed rated SD card..

I have constant screen freezes on any build i use. bangsters1.3b has the lowest. it only freezes when i am in a phone call and the screen turns off. It lasts for about 15 seconds to 1m. then recovers. makes for some interesting post ended phone call conversations.

Trying your settings, MadRabbit.

Will give it a try, thanx
Should be better if we post our impressions so far within 24 hours

vysus said:
Will give it a try, thanx
Should be better if we post our impressions so far within 24 hours
Click to expand...
Click to collapse
Yep, that way we can find tune the settings for what works best.

ill give this ago i dont tend to get slow wakeup problems but i do how ever get screen freezes so hope this helps as when i playing a game it can make it really hard to attack people when screen isnt picking up my figures

What exactly is the interactive governor? And why not set the mins to 245 so the processor is scaled down when its not being used?

genesis123 said:
What exactly is the interactive governor? And why not set the mins to 245 so the processor is scaled down when its not being used?
Click to expand...
Click to collapse
Minimums may cause an issue with the phone when it wakes up from sleep, especially if you have a higher class memory card.

I've noticed that my usual drain became slow during last hour, I'll report better news tomorrow, leaving device in stand-by at 69% battery left.

Ok, i didn´t think i was that stupid at this but now i don´t know anymore
I´ve searched both in andoids market and on the XDA app on the phone but i can´t find the app setCPU.
Heeellp!!

Ante78 said:
Ok, i didn´t think i was that stupid at this but now i don´t know anymore
I´ve searched both in andoids market and on the XDA app on the phone but i can´t find the app setCPU.
Heeellp!!
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=505419

From 69% at 12.15 AM, battery dropped to 61%.
That's what I've seen when I press the home key at 6.45, cool :;

thanks man! just tried your setting, and then used current widget to check : 4mA when the phone was in sleep mode. This is the lowest result i've ever have ( i got 7~9 mA before)

ive ran this setting today and battery its definitely draining slower... ill report in a few days of using these settings...

I use it until this morning and I find that very good.
@madrabbitt : I take the permission to put your post on a french forum :
http://htc-touch-hd.forumactif.biz/hd2-and-informations-et-assistance-f50/profils-setcpu-t30775.htm
I hope you're not angry !
Thanks a lot

Thanks! I will try your settings, mine were a little off and gave me 45mA in standby One question though, what sample rate do you use? mine is still default (50000).

I have setCpu 2.03 installed but i can't find the Interactive setting?
Where is it, or do i have the wrong setCpu version?
Grtz
Sent from my HTC HD2 using XDA App

Undervolt Setcpu settings

Hey guys. i'm using Solarflare rom and it uses snowleopard kernel. What's the right settings to undervolt it? I want to extend my battery life more. I tried to change the values in the undervolt settings but the phone always hangs.

actually i want to know those settings too, my battery seems to be running out so quickly.

Actually SetCPU UV settings are different from phone to phone, you have to find your own good settings. Just start running a day with -25mV on the different speeds and see if it's stable and if so lower it another -25mV the next day etc...
And if you are running out of battery too quickly try to set a screen off profile 200-500MHz with a conservative governor. Also try to recalibrate your battery if you have not done that, that may work wonders on your phones. What kind of battery times are you getting ? Screentime ?

Like Reidar said it's different for every device. Right now I'm using Ninphetamine v2.05 and I'm UC @ 800mHz. With UV I have it at -125mV for 800mHz, 500mHz, and 200mHz with a conservative screen off profile. Been running this for a while now and it has been stable.
A quick tip, if you want to see if a new voltage is stable quickly is to set the voltage and run a stress test in setCPU. And always remember to uncheck the Set on Boot box when testing voltages or even CPU speeds.
Sent from my Galaxy S II using MIUI

With my GS2 i use screen off profile on demand 200Mhz with undervolt of 800mV and work very nice, only thing is a 0,5 sec lag when i unlock my phone

http://forum.xda-developers.com/showthread.php?t=1158102&highlight=SetCPU