Ubuntu - GPU - AMD GPU - Power Management

dpm is the default power management method; and it has three main modes of operating:

Check the existing Power Management Method

cat /sys/class/drm/card0/device/power_dpm_state

returns:

performance

sudo echo performance > /sys/class/drm/card0/device/power_dpm_state

NOTE: Even if GPU is set to performance-mode it does not mean that the GPU is running with highest clockspeeds all the time.

If it is desirable to run the GPU at the highest speeds all the time, even if there is no actual load:

sudo echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level

This manually overrides the dpm behaviour.
This is however mainly intended for testing purposes but may also be useful when doing GPU benchmarks.

To give control back to dpm following command is needed to run:

sudo echo auto > /sys/class/drm/card0/device/power_dpm_force_performance_level

A list of all available modes can be found on dri.freedesktop.org.

In order to set clocks and voltages with AMDGPU, first set the performance level to manual:

sudo echo manual > /sys/class/drm/card0/device/power_dpm_force_performance_level

Then, adjust clocks/voltages according to the Linux AMDGPU sysfs documentation with the pp-od-clk-voltage control file.