0

Is there way to unlock min cpu frequency for Ubuntu 19.10 64-bit for raspberry pi?

First, this linux does't have /boot/config.txt similar to raspbian or ubuntu 18.04 from berryboot

Next, the following code has no effect

root# echo 100000 > /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_min_freq

As a developer I need to test a heavy multithreaded code on a range of online cores with different CPU freq

I need to find a way to downclock CPU freq from 600 MHz down to 100 MHz (similar to raspbian)

P.S. I'm using official image from https://ubuntu.com/download/raspberry-pi

P.P.S. Also I need to switch off online cores using /sys/devices/system/cpu/cpu{1,2,3}/online files. But it does not work and kernel does not support it:

root@ubuntu /sys/devices/system/cpu/cpu3 $ echo 0 > online
-bash: echo: write error: Operation not supported
3
0

the raspberry's config.txt in ubuntu is located at /boot/firmware/config.txt, you can use it to specify range min max in the hardware, and then use cpufrequtils in ubuntu to actually set the cpu freq

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.