How to change raspberry pi 2 overclock to default on Raspbian

Question

I've been wondering how I could reset my raspberry pi 2 to its stock clock after I used the raspi-config utils. The only options I had were primarily for the first Raspberry. There's no "default" value for the Pi2.

Something like this:

Chose overclock preset                                                       

 None    700MHz ARM, 250MHz core, 400MHz SDRAM, 0 overvolt                     
 Modest  800MHz ARM, 250MHz core, 400MHz SDRAM, 0 overvolt                     
 Medium  900MHz ARM, 250MHz core, 450MHz SDRAM, 2 overvolt                     
 High    950MHz ARM, 250MHz core, 450MHz SDRAM, 6 overvolt                     
 Turbo  1000MHz ARM, 500MHz core, 600MHz SDRAM, 6 overvolt                   
 Pi2    1000MHz ARM, 500MHz core, 500MHz SDRAM, 2 overvolt  

As you can see, it's possible to overclock the default 900Mhz from the raspberry pi 2, but there's no solution for going back to stock configuration using the raspi-config tool. So how on Earth are we supposed to rollback after an overclock?

Answer 1

After some digging, I found a rather simple solution. You'll have to edit your config.txt file. Located on the FAT partition of your raspberry pi SD card. It's perfectly possible to do it using the pi itself, or you could just plug the microSD card on your computer and use your favorite editor for this.

Ok, now to the configurations...

I'm assuming you're using the raspibian with the command line, but again, you can do this with any text editor.

First, obviously, open the config.txt file. It's located on the path /boot/config.txt.

E.G.: sudo nano /boot/config.txt

With your file open, try to find those lines:

arm_freq=1000
core_freq=500
sdram_freq=500
over_voltage=2

Change those with these ones:

arm_freq=900 
core_freq=250 
sdram_freq=450

And this line on the file:

over_voltage=2

Just comment it to be like this, or erase it:

#over_voltage=2

For more information about overclocking your raspberry pi (Version 1 or 2, model A or B) refer to this link. And if you want to learn a little more about the configuration file itself, use the official docs.

I hope this Q/A post helps someone. Thanks for your attention, and happy coding ;)