Comment # 7 on bug 106306 from grmat@sub.red

Thank you for your answer.

I've already set the ppfeaturemask accordingly.

cat /sys/class/drm/card0/device/pp_od_clk_voltage

returns nothing and 

[root] echo "s 7 1000 1200" > /sys/class/drm/card0/device/pp_od_clk_voltage

prints "Invalid argument"

at the time of trying to write to the file, the following is put to the kernel
ring buffer:

amdgpu: [powerplay] OverDrive feature not enabled