I made a new 22.04.1 LTS install today.
I wanted to test an app I made that modifies your CPU's clock frequency.
The first step for testing was to change the scaling governor to userspace so I can set a specific frequency.
I ran the following command in a bash shell:
sudo echo "userspace" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
I tried both with and without quotes on the word userspace and the path. I know this just changes the one core, but I was just testing
I ran into the issue: bash: /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor: Permission denied
I found this post: scaling governor throws permission error for su, and according to the accepted solution, modified my command to the following:
sudo sh -c "echo -n userspace > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor"
But now I get:
sh: echo I/O error.
I was really confused, and I found a guide on another website I can't find again. Anyway, I changed my code to:
echo "userspace" | sudo tee /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
Again, I tried with and without quotes on both the word userspace and the path. But now I get:
userspace
tee: /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor: Invalid argument
What I was just wondering is if there is any way to set the cpu scaling governor from the command line? I know there are packages like cpupower, but I would like to set scaling governor and frequency without any required packages. If this is not possible, please let me know.
Thank you so much for your help!
Android776
/sys/devices/system/cpu/cpu0/cpufreq/and filescaling_governorinside it exist? if it exists, you should be able to write it as root, but if it doesn't exist, you cannot create it. If it doesn't exist that means you have no "cpufreq" available , and you should dig into bios / kernel configurations - can you post your cpu information andgrep FREQ /boot/config-$(uname -r)please? – Cagri Sep 14 '22 at 14:48