I am using a AMD RX 7800 XT and noticed that my idle power consumption has went up recently from ~5-10W to ~30W. After some investigation I found out it was caused by the change to the default power profiles from BOOTUP_DEFAULT
to 3D_FULLSCREEN
in 6.13. When in 3D_FULLSCREEN
profile, the GPU memory clock won’t transition to the lowest clock speed and consuming extra ~20W (!!) of power.
To fix this, I have to manually change the power profile using following commands (as root):
echo 'manual' > /sys/class/drm/card1/device/power_dpm_force_performance_level
# check the available power profiles to get the index
cat /sys/class/drm/card1/device/pp_power_profile_mode
# normally 0 = BOOTUP_DEFAULT
echo 0 > /sys/class/drm/card1/device/pp_power_profile_mode
(you may need to change card1
to card0
depends on your system)
Note that the configuration is not persisted across reboot and you may encounter shuttering during gaming with BOOTUP_DEFAULT
.
I recommend to use tools like LACT to automatically apply the power profile on startup and also automatically switch the profile to 3D_FULLSCREEN
when running games.
Edit: you should check you current GPU idle power consumption first (with nvtop
or lm_sensors
) before applying the change, the issue may not affect all AMD GPU
video playback will likely kick the asic out of idle. What’s your power use at true desktop idle?
Generally speaking, vega 10 (56, 64) and 20 (radeon vii) are able to achieve decently low desktop idle with varied display configs due to the memory technology they employ.
I killed Firefox and waited a while, and now I’m seeing 17-19W.