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Old July 8th, 2010, 02:09 PM   #1 (permalink)
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Default [ROOT] Using SetCPU + Perflock Disabler to Save Battery, Underclock

I'm sure many people has seen the thread where OverclockWidget was claimed to have increased the battery life for some people. Near the end of the thread I became skeptical and proved that it had in fact no effect on the CPU speeds at all, and so can not save battery life. Well, good news is that a new function in the competing SetCPU app will now get you a real, tested increase in battery life.

According to my tests, my Evo with the screen off should theoretically get a 64 hour battery life!



Know what you're doing? Short version: Get latest SetCPU (version at least 2.0.0) and use Menu -> Perflock Disabler in the Main tab to enable underclocking.

Don't know what I'm talking about? Good, follow this tutorial:

Prereqs:
  • You need to have ROOT. Unrevoked root method is confirmed to work, and so is Toast's root method. Usually I wouldn't recommend using Unrevoked, but it's just so fast to set up, and perfect for those who have no clue what ROOT means.
  • Buy SetCPU from the market, or download it from XDA forums for free. Please support the developer of this incredible app! The version must be at least 2.0.0b
  • Be on the STOCK kernel. If you're on a custom kernel, chances are that perflock has already been disabled, and you won't need this tutorial to underclock. Some custom ROMs come with the stock kernel (like Fresh 0.5.3) and some don't (like Baked Snack .9.6)

Alright, got the prereqs down? Lets start this.

HOWTO:
  1. Open SetCPU and give it root permissions as necessary. As a control, go into the Info tab and do the Long Bench a few times. You should get around 1000ms.
  2. Go to the Main tab, hit MENU, hit Perflock Disabler (read the warning!), and hit Disable Perflock Beta: May crash!
  3. It will work for a while, and then say it's successful. You can then click the X on the top right to exit the Perflock Disabler.
  4. Go into the Main tab and drag Max: all the way down to 245000 (245Mhz). Make sure the green xxx max xxx min label above the sliders show 245 for both and also disable any Profiles you've set. Go to Info tab, then hit Long Bench again. This time you'll get something ridiculous like 5000ms, meaning that the Perflock Disabler has worked!
  5. Change your settings Profile tab to something similar to my settings. You can mess around with the Battery < xx% profiles to fit your needs. Your exact Profile priorities do not matter, it's only important that some have HIGHER priority than others. On the Main tab, set Max all the way to the right (998400) and Min all the way to the left (245000), Scaling to ondemand, and check Set on Boot. Do not check Set on Boot yet if you're the super careful kind. You can check it later when you've tested that your phone isn't crashing

    The last entry is Battery < 100%, set at lowest priority, with MAX as the highest value, MIN as the lowest value, and scaling as ondemand.

Congratulations you're now able to underclock your Evo!

Comparison:
The only applicable parts is after the charging finishes (after the solid green bar ends)

Before Perflock Disabler:


After Perflock Disabler:

See that little dip at the end? That's when I was turning the screen on and messing with the phone for this tutorial. What a difference.

Disadvantages:
  • Yes, not everything is happy and pretty. As the Perflock Disabler warning says, you HAVE to apply the Perflock Disabler on every boot. If you forget, then your SetCPU settings will have no effect on the Evo. Install a custom kernel that already has Perflock disabled if you do not want to do this on every boot.
  • Also, since this clocks the Evo down when the screen is off, you may get a slight (super slight!) delay when you turn the screen back on. This is because the profile changes from Screen Off to Battery < xx% and SetCPU needs to clock the CPU from 245mhz to 998mhz.

FAQ:
What is Perflock Disabler?
HTC added a "perflock" in their stock kernels to prevent over/underclocking. SetCPU's Perflock Disabler, like its name implies, disables this restriction.

How come your screenshots show that you can go down as high as 1.19Ghz and as low as 128Mhz?
I'm using this custom kernel.

Will this work with OTA update xxx.xxx.xxx.xxx?
Yes, as long as you have root, and don't lose it when you update (do your research!) then this will work.

What are your settings?
Wifi ON, Bluetooth OFF, GPS ON, Mobile network Data OFF (ATT contract with dumbphone still not over), Screen Timeout 1MIN, Brightness AUTO, Advanced Task Manager set to SAFE kill tasks when screen is off.

What is that cool looking battery monitoring app?
That's SystemPanel, paid on the market. A free alternative is JuicePlotter, also on the market. Screenshots were taken with Drocap2.

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Old July 8th, 2010, 02:21 PM   #2 (permalink)
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Excellent walkthrough...good to see it all in one place. I had everything set the same way from your reply on the other thread, but this let me double check everything.

Perflock disabled works on Fresh 0.5.

Testing battery life today.
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Old July 8th, 2010, 02:24 PM   #3 (permalink)
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perfect! !!
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Old July 8th, 2010, 02:26 PM   #4 (permalink)
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Quote:
Originally Posted by MyRCode View Post
Excellent walkthrough...good to see it all in one place. I had everything set the same way from your reply on the other thread, but this let me double check everything.

Perflock disabled works on Fresh 0.5.

Testing battery life today.
Interesting, I assumed that all custom ROMs included a custom overclockable kernel, but after reading Fresh's changelog (PowerTOP section) again I'll have to revise the prereq part.
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Old July 8th, 2010, 05:29 PM   #5 (permalink)
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SetCPU on... I'm running Damageless Rom v3.2.3.
Custom Kernal for Nova Screen FPS Fix and undervolt configurations.

phones was charged to 97% when i took it off the charger.

My phone has Bluetooth, 3G, GPS, and Brightness at 25%. Off the charger for 2 hrs and 53 mins with 3 phone calls at about 5 min each. Browsed the web and received email. I'm currently @ 93%
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Old July 8th, 2010, 08:22 PM   #6 (permalink)
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going to try this new version with perflock
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Old July 9th, 2010, 09:49 AM   #7 (permalink)
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Quote:
Originally Posted by htc.EVOlution View Post
SetCPU on... I'm running Damageless Rom v3.2.3.
Custom Kernal for Nova Screen FPS Fix and undervolt configurations.

phones was charged to 97% when i took it off the charger.

My phone has Bluetooth, 3G, GPS, and Brightness at 25%. Off the charger for 2 hrs and 53 mins with 3 phone calls at about 5 min each. Browsed the web and received email. I'm currently @ 93%
Some people from XDA have been saying that setting sleep at 245Mhz has been giving them better battery life than 128Mhz for whatever reason. Think I'm gonna test it a bit further to get the sweet spot.
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Old July 9th, 2010, 10:08 AM   #8 (permalink)
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So I did a test last night.

took it off the charger @ 10:30 with battery @ 100%.
It's 8:08am right now and i'm showing 93%. That's with 3G, Bluetooth, GPS on.
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Old July 9th, 2010, 10:54 AM   #9 (permalink)
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Im running fresh rom 1.0B and just installed this. Thanks PPB.

I will report back later tonight or tomorrow.
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Old July 9th, 2010, 04:36 PM   #10 (permalink)
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Updated the OP. The task manager I use is called Advanced Task Killer Pro. Also updated the wording in the Profiles step to show that you can change the battery level/speed any way you see fit.

Quote:
Originally Posted by DaDoc04 View Post
Im running fresh rom 1.0B and just installed this. Thanks PPB.

I will report back later tonight or tomorrow.
Let us know!
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Old July 9th, 2010, 04:40 PM   #11 (permalink)
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pingpongboss, are you running the undervolt or normal voltage kernel?
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Old July 9th, 2010, 04:41 PM   #12 (permalink)
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Quote:
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pingpongboss, are you running the undervolt or normal voltage kernel?
Undervolt. It's great.
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Old July 9th, 2010, 05:21 PM   #13 (permalink)
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marked
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Old July 9th, 2010, 11:25 PM   #14 (permalink)
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Default Re: [ROOT] Using SetCPU + Perflock Disabler to Save Battery, Underclock

So i can flash the undervolted kernel and still clock at 1ghz...it just consumes less...?

Sent from my HTC EVO
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Old July 9th, 2010, 11:55 PM   #15 (permalink)
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Quote:
Originally Posted by justpastfinish View Post
So i can flash the undervolted kernel and still clock at 1ghz...it just consumes less...?

Sent from my HTC EVO
Not sure how it works. It might just be the lower speeds that are undervoltaged. Or the whole thing. Not sure. Maybe try asking on the XDA thread.
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Old July 10th, 2010, 01:27 AM   #16 (permalink)
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Quote:
Originally Posted by pingpongboss View Post
Some people from XDA have been saying that setting sleep at 245Mhz has been giving them better battery life than 128Mhz for whatever reason. Think I'm gonna test it a bit further to get the sweet spot.
i have my sleep set at 245mhz, and it's eliminated any lag I was getting when I would wake up the phone when it was set at 128mhz during sleep
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Old July 10th, 2010, 09:15 AM   #17 (permalink)
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Thank you for sharing this. Running FreshToast100b1 and incorporating your settings as a starting point. I'll report back with battery life. Thanks again.

Side note: Running Toast kernal, while attempting to disable Perflock, SetCPU reported back that Perflock was not present, no need to disable. Nice feature.
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Old July 10th, 2010, 02:38 PM   #18 (permalink)
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Quote:
Originally Posted by uminchu View Post
Thank you for sharing this. Running FreshToast100b1 and incorporating your settings as a starting point. I'll report back with battery life. Thanks again.

Side note: Running Toast kernal, while attempting to disable Perflock, SetCPU reported back that Perflock was not present, no need to disable. Nice feature.
Ah, yes. I believe thatkernel is configured to be overclockable by default.
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Old July 11th, 2010, 02:10 AM   #19 (permalink)
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Changed the Profiles picture in the tutorial. I initially had Charging priority over Screen Off, but it makes more sense to have Screen Off to have higher priority.
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Old July 11th, 2010, 11:51 AM   #20 (permalink)
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dang pingping... you hit some android news sites regarding your guide. NICE STUFF
Rooted HTC EVO 4G Users: Use SetCPU To Extend Battery Life | Android News, Reviews, Applications, Games, Phones, Devices, Tips, Hacks, Videos, Podcasts - Android Police
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Old July 11th, 2010, 01:12 PM   #21 (permalink)
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I'm now on 21 hours since last unplugged. Freaking amazing!! I'm blown away.
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Old July 11th, 2010, 03:08 PM   #22 (permalink)
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Dang, I never expected that.
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Old July 12th, 2010, 12:18 PM   #23 (permalink)
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Thanks to the OP for the writeup. I use this with Setting Profiles, and I am seeing some amazing battery times. Setting Profiles has a bunch of features of Locale, with out the big price tag.

Also, instead of clocking all the way up to the top, I have mine set to 768, and if the battery drops below 45%, I have it slowing down more to stretch the battery.
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Old July 12th, 2010, 07:07 PM   #24 (permalink)
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Quote:
Originally Posted by wkendrvr View Post
Thanks to the OP for the writeup. I use this with Setting Profiles, and I am seeing some amazing battery times. Setting Profiles has a bunch of features of Locale, with out the big price tag.

Also, instead of clocking all the way up to the top, I have mine set to 768, and if the battery drops below 45%, I have it slowing down more to stretch the battery.
Nice, that's a great way to fully extend battery life beyond what this tutorial does.
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Old July 15th, 2010, 06:04 AM   #25 (permalink)
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I love this tip! My battery meter now practically flatlines whenever the screen is off. The only downside is now I find myself using the device more often which almost counteracts the battery saving, but I guess that's the point... Thanks so much!
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Old July 16th, 2010, 01:12 PM   #26 (permalink)
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i vote for a sticky. great information & thank you very much pingpong
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Old July 16th, 2010, 01:29 PM   #27 (permalink)
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i just did this.....will post results tomorrow.
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Old July 18th, 2010, 10:09 PM   #28 (permalink)
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posts like this are the best thing about the forum. use use the fresh toast bfs fps kernel so it doesn't apply to me, but excellent work!
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Old July 19th, 2010, 11:01 AM   #29 (permalink)
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so any chance that in near future we wont have to set perflock after each boot?
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Old July 19th, 2010, 11:03 AM   #30 (permalink)
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Quote:
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so any chance that in near future we wont have to set perflock after each boot?
Don't think HTC will ever willingly remove perflock from their stock kernels.
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Old July 19th, 2010, 11:20 AM   #31 (permalink)
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Quote:
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Don't think HTC will ever willingly remove perflock from their stock kernels.
oh ok
but maybe you can add an option to in program to disable when setcpu starts?
just wondering
just sometimes i reboot and be thinking im saving battery when its actually doing nothing becauase i forgot to disable perlock

great program tho
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Old July 19th, 2010, 12:20 PM   #32 (permalink)
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Quote:
Originally Posted by wkendrvr View Post
Thanks to the OP for the writeup. Also, instead of clocking all the way up to the top, I have mine set to 768, and if the battery drops below 45%, I have it slowing down more to stretch the battery.
Yeah HUGE THANKS to PPB! And your idea is something that I'm going to try right now and see how things play out. I can say that my battery life has really improved and I'm loven my EVO even more .
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Old July 19th, 2010, 06:35 PM   #33 (permalink)
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Originally Posted by MDbandit View Post
oh ok
but maybe you can add an option to in program to disable when setcpu starts?
just wondering
just sometimes i reboot and be thinking im saving battery when its actually doing nothing becauase i forgot to disable perlock

great program tho
This feature request is better directed at the author of the app SetCPU for Root Users [2.0.1] This *actually* changes everything. 07/05/2010 - xda-developers

Although they have a reason for not including it yet, since that feature is still In beta.
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Old July 23rd, 2010, 10:14 AM   #34 (permalink)
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Hey Ping,

When I installed setcpu, I was getting decent battery life (20hrs at one point) but it seemed to be draining my performance on the phone (lots of lag, slight freezing, etc.) I don't know if I am doing something wrong, but I have followed your instructions to a T.

I am using unrevoked 3.
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Old July 23rd, 2010, 10:31 AM   #35 (permalink)
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Quote:
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Hey Ping,

When I installed setcpu, I was getting decent battery life (20hrs at one point) but it seemed to be draining my performance on the phone (lots of lag, slight freezing, etc.) I don't know if I am doing something wrong, but I have followed your instructions to a T.

I am using unrevoked 3.
Are you on the stock kernal and stock rom? Post a screenshot of your profiles and ill take a look. Use drocap2 from the market.
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Old July 23rd, 2010, 12:49 PM   #36 (permalink)
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@ PPB

I've been playing around with settings with SetCPU using Fresh 1.0.1 with #26 kernel. After do some research, I saw on the dev's website that it's better to set a profile that uses the same max/min to performance instead of on demand. And my device seems to respond better using 1036max and 348min. For screen off, I also use 348 for max/min as well. Any thoughts? Just kind of playing with different configurations to see what yields the best results.
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Old July 23rd, 2010, 12:51 PM   #37 (permalink)
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Quote:
Originally Posted by pingpongboss View Post
Are you on the stock kernal and stock rom? Post a screenshot of your profiles and ill take a look. Use drocap2 from the market.
All I did was run unrevoked3. I have not touched adding kernals or any other roms, so everything is stock.

I uninstalled it, but I can reinstall it again and add your profiles and give you a screen post.

Thanks for the quick reply!
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Old July 23rd, 2010, 01:09 PM   #38 (permalink)
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@ PPB

I've been playing around with settings with SetCPU using Fresh 1.0.1 with #26 kernel. After do some research, I saw on the dev's website that it's better to set a profile that uses the same max/min to performance instead of on demand. And my device seems to respond better using 1036max and 348min. For screen off, I also use 348 for max/min as well. Any thoughts? Just kind of playing with different configurations to see what yields the best results.
I haven't messed around too much with the optimum Max/min values. But it is pretty odd that a profile with the same Max min set to performance would make a difference compared to the same profile set to on demand.

Also your saying that 1036 max is performing better than 1150? Again, odd but I guess its possible. When CyanogenMod stabilizes, ill do some of my own tests. Right now CM is a battery eater.

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All I did was run unrevoked3. I have not touched adding kernals or any other roms, so everything is stock.

I uninstalled it, but I can reinstall it again and add your profiles and give you a screen post.

Thanks for the quick reply!
Did your problems disappeared after you uninstalled SetCPU? It should bewprking just fine for your stock configuration as far as I can see.
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Old July 23rd, 2010, 02:16 PM   #39 (permalink)
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Are you on the stock kernal and stock rom? Post a screenshot of your profiles and ill take a look. Use drocap2 from the market.
Here are my screen shots:

Yea after I uninstalled setcpu the first time it went back to being snappy.

One problem I see is that my max only goes up to 998
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Old July 23rd, 2010, 02:55 PM   #40 (permalink)
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My max only goes up to 998 as well.
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Old July 23rd, 2010, 05:36 PM   #41 (permalink)
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I haven't messed around too much with the optimum Max/min values. But it is pretty odd that a profile with the same Max min set to performance would make a difference compared to the same profile set to on demand.

Also your saying that 1036 max is performing better than 1150? Again, odd but I guess its possible. When CyanogenMod stabilizes, ill do some of my own tests. Right now CM is a battery eater.
My research was pulled from this link-SetCPU for Root Users

7. CPU Scaling Governors
CPU governors control exactly how the CPU scales between your "max" and "min" set frequencies. Most kernels have "ondemand" and "performance." The availability
ondemand - Available in most kernels, and the default governor in most kernels. When the CPU load reaches a certain point (see "up threshold" in Advanced Settings), ondemand will rapidly scale the CPU up to meet demand, then gradually scale the CPU down when it isn't needed.
conservative - Available in some kernels. It is similar to the ondemand governor, but will scale the CPU up more gradually to better fit demand. Conservative provides a less responsive experience than ondemand, but can save battery.
performance - Available in most kernels. It will keep the CPU running at the "max" set value at all times. This is a bit more efficient than simply setting "max" and "min" to the same value and using ondemand because the system will not waste resources scanning for the CPU load. This governor is recommended for stable benchmarking.
powersave - Available in some kernels. It will keep the CPU running at the "min" set value at all times.
userspace- A method for controlling the CPU speed that isn't currently used by SetCPU. For best results, do not use the userspace governor.

This caught my attention...so I decided to try it. On the performance difference on settings, well I know that 1150 will perform better, but I wanted the best of both worlds in terms of performance and battery life. And thus far today, my battery sits at 64% with moderate use (web surfing, 20 minute phone call, several texts/emails)...it's been off the charger since 7am...so, I'm very happy. But again, I'm not a pro at this, just an eager geek trying to learn the ins and outs of the beautiful operating system .
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Old July 23rd, 2010, 06:39 PM   #42 (permalink)
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This is a bit more efficient than simply setting "max" and "min" to the same value and using ondemand because the system will not waste resources scanning for the CPU load.
Hmm when you say it this way it actually makes some sense. I should check it out,thanks.

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Here are my screen shots:

Yea after I uninstalled setcpu the first time it went back to being snappy.

One problem I see is that my max only goes up to 998
The stock kernel has a 998 MHz max, that's not the problem. The only thing I can find off with your screenshots is that apply on boot on the main tab is not checked. Also my up threshold on the advanced tab is set to 70, and I don't remember ever changing it from the default. Also, I assume that you've been hitting menu -> perflock disabler on every boot up. If your still getting lag then I have no more explanations
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Old July 25th, 2010, 10:35 AM   #43 (permalink)
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Hmm when you say it this way it actually makes some sense. I should check it out,thanks.



The stock kernel has a 998 MHz max, that's not the problem. The only thing I can find off with your screenshots is that apply on boot on the main tab is not checked. Also my up threshold on the advanced tab is set to 70, and I don't remember ever changing it from the default. Also, I assume that you've been hitting menu -> perflock disabler on every boot up. If your still getting lag then I have no more explanations
Ok, i guess Ill have to monitor it then.
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Old July 25th, 2010, 11:52 AM   #44 (permalink)
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I have all settings I believe to how the OP posted, I'm a very light user of my EVO because I have a second phone (business blackberry) but some days my evo battery is great and some days it stinks. i've never complained about it before because I'm such a light user I feel that my battery never has problems. Being such a light user however I'm always willing to learn how to get more battery life because I can tell when I do fiddle with my phone the battery drops like a rock.

As of yesterday I setup the setcpu and juiceplotter and under info it says from when I unplug the phone that I will have anywhere from 8-11 hours of battery.

I just installed advanced task manager and set to safe kill and when screen is off just as in the OP. I will repost what juiceplotter tells me, but the main point of my thread is that it doesnt seem to be working for me. Want to see if anybody can give me a hand.

Im on unrevoked3 stock only interested in wifi tethering and well I have titanium backup installed but don't even know why not really concerned with what I have on my phone (so thats first question) should I delete that?

Second thing is that Ive done all the other previous posts, only syncing i have is gmail and weather every 2 hours. check my running services for anything that shouldnt be running.

Basically don't know what else to do but this setcpu settings don't seem to be doing much.

anybody got something for me?

*edit* these are my programs i have installed from the market, I'm willing to get rid of any ONE or couple of these apps if they definately do drain battery**

advanced task killer
juiceplotter
astro file manager
titanium backup
ebay
google voice
double twist player
text to speech extender
snesoid lite
google translate
qik for htc evo
tapatalk
yelp
shazam
adobe reader
bubble burst free
wheres my droid
espn score center
wordup
google maps
slingplayer mobiel
pandora radio
compass
real blackjack
urbanspoon
led desire light
speedtest.net speed
mobile banking
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Old July 29th, 2010, 04:37 AM   #45 (permalink)
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I have Fresh 1.0.1 and the FPS fix for it... do I need to flash a different kernel for undervolt? (I'm buying setcpu right now) Thanks!

EDIT: I put in all the profiles and everything you have listed, but I get a message saying I don't have a perflock so it doesn't need to be disabled... is that normal? Will this method still save me some battery life?
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Old July 31st, 2010, 10:13 PM   #46 (permalink)
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Thanks, great guide. One question though. Do I need to leave setcpu running in the back ground or can I close it?
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Old August 3rd, 2010, 11:59 PM   #47 (permalink)
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I have Fresh 1.0.1 and the FPS fix for it... do I need to flash a different kernel for undervolt? (I'm buying setcpu right now) Thanks!

EDIT: I put in all the profiles and everything you have listed, but I get a message saying I don't have a perflock so it doesn't need to be disabled... is that normal? Will this method still save me some battery life?
The FPS fix kernel should already have perflock disabled. The profiles here can still help you though.
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Thanks, great guide. One question though. Do I need to leave setcpu running in the back ground or can I close it?
Pretty sure you can close it
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Old August 4th, 2010, 12:10 AM   #48 (permalink)
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Please help. I did the Netarchy ROM 2.2 OTA update with his custom kernels.

I have lost Preflock on SetCPU. I get an error saying incorrect Kernel. ???

Thanks. Really appreciated.
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Old August 4th, 2010, 12:12 AM   #49 (permalink)
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Please help. I did the Netarchy ROM 2.2 OTA update with his custom kernels.

I have lost Preflock on SetCPU. I get an error saying incorrect Kernel. ???

Thanks. Really appreciated.
Whats the entire error message? Also, can you clarify: Did you have the Netarchy kernel and then do the OTA update? In that case, the update installed HTC's stock kernel, and removed your root access. You won't be able to use SetCPU until the devs figure out how to root the new OTA update.
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Old August 4th, 2010, 12:16 AM   #50 (permalink)
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Hey brah, you are the man.

No, I followed the directions exactly. This is my full post from xda:

I followed the directions exactly. Except I did everything with ROM Manager. Did a backup and wipe. The first update went perfect. Rebooted. Reinstalled ROM Manager from the Market. Flashed the radio. Did not do any kind of wipe for this. Rebotted. Opened RM again and I got a failure notice. I reinstalled ClockWorkMod on the advice of another post I found then flashed WiMax. Rebooted. Then reinstalled some stuff from Titanium Backup but NOT System data or anything HTC.

Everything's awesome!!! 8mp camera. Google Goggles works perfectly. 4G indoors where I never had it before. I don't have one single bar of 4G in my bedroom but I'm getting over 1800mbps up. Now thats loving.

But I have lost my WiFi. All it says is scanning, connected, disconnected over and over. I'm afraid to reflash anything until I get some advice.

I did all this over Unrevoked3 and SetCPU.

I also lost Preflock on SetCPU. I get an error saying incorrect Kernel. ???

I have also lost Wireless Tether. It turns on and has SU Permissions but cannot be recognized by my iPad.

Can someone please help? I'm coming from the iP4 and a super noob to Android but I've done my homework.

Thanks. Really appreciated.
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