No-frills CPU Control
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This app requires ROOT permissions.
If you don't know what root permissions are, you probably don't need this app.
No-frills CPU Control is a tool you can use on your rooted  device to quickly set the CPU frequencies and governor to use.
It allows you to use the highest frequency your phone supports and gain some precious FPS in your preferred game, or go down to the lowest frequency and gain some more juice when your phone is sitting idle.
All of this without any memory footprint or services running in the background!
It has been reported working on a large number of rooted  devices from HTC, Samsung, Motorola, LG, Huawei, ZTE, Oppo and so on! Even Kindle and Nook Color!
Unfortunately, it does NOT work on Flytouch tablets, Zenithink zt180, HaiPad M7/Tabtech M7 or fake HTC/Samsung clones. Sorry about that, but you knew what you were buying when you did... didn't you?
Is your device supported? You need ROOT permissions and you'll probably need to be running a CUSTOM ROM (an example is the famous CyanogenMod) with kernel frequency scaling enabled. If you are unsure... just install the app and see for yourself!
If you need a custom ROM for your phone, the best places to find one are XDA [http://forum.xda-developers.com], MoDaCo [http://android.modaco.com/] or similar forums.
Be wary of the frequencies you select! Your phone may lock or become unresponsive if it doesn't like extreme values, but -hey- better safe than sorry: even though No-frills CPU Control allows you to choose if you want to apply the settings on boot, it comes with an extra "safety valve" too! If the device doesn't shut down (or reboot) in a clean way, it will not apply the settings, avoiding those nasty boot-loops you may have had with other overclocking apps. Please keep in mind that apps like QuickBoot are as quick as they are unsafe…
- Easy GUI to set frequencies, governor and i/o scheduler
- "safety valve" to avoid boot-loops in case of unsafe settings (more info in the homepage)
- Stats screen to see the effective usage of frequencies
No-frills CPU Control is open source under Apache 2.0 license. You can find the source code, more informations and you can ask for questions on its project post directly on XDA: http://forum.xda-developers.com/showthread.php?t=911917
SUPPORT: If you have any problems, before you write a negative comment, write an email or go to the homepage to get answers.
If I don't reply you or solve your problem, then go ahead and post a negative comment.
HINT: If you can't find the email of the developer, use the "Send CPU data" feature from the main screen, instead, and add your questions.
This app is FREE and will always be FREE.
Translations are ALWAYS welcome and are now as easy as getting a (free) account to http://www.getlocalization.com/noFrillsCPU/ and correcting what's wrong or filling what's missing. A HUGE "THANK YOU!" to all the people who helped translating this app! (jdb78, kallt_kaffe, David Kejzlar, Ryunosuke Tanaka, Charlie Cheung, dxdiag32, Corentin Garcia, Carlos Camacho, dancer_69, TorbenKB, Chris, FollowWings, Spaar, prescott66, Marco Bizarro, Cristian Silaghi, Cenk H. Uzunboy)
Starting with version 1.21 the app has a new look & feel matching the new Android 4.0 Ice Cream Sandwich and has dropped support for older Android releases (1.6 and 2.0). Don't worry! There's a new app, No-frills CPU Control CLASSIC which will always have the same features as the classic app with the old look & feel!
: if you don't know what a ROOTED device is, you can find a pretty good explanation here: [http://www.androidauthority.com/rooting-for-dummies-a-beginners-guide-to-root-your-android-phone-or-tablet-10915/]
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r2: Fixed crash when opening About screen.
r1: Added explicit ACCESS_SUPERUSER permission for transparency.
Fixed I/O scheduler setting for special devices (e.g.: Minix X5, thanks to DaPa).
Fixed wrong count of CPUs (thanks to DaPa).
Updated current translations. If you spot an error, you can fix it at http://getLocalization.com/noFrillsCPU