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

  • nexvOPEnglish
    2·
    10 hours ago

    Interesting, maybe this issue only happens for RDNA3?

    I’m also using F41 with same kernel but with KDE. Display is 2560x1440 @ 120Hz. On 3D_FULLSCREEN, my pp_dpm_mclk is on 772Mhz most of the time with some occasional 456Mhz, but never drop to 96Mhz. It will only drop to 96Mhz if I change to BOOUP_DEFAULT (or POWER_SAVING).

    • Vik@lemmy.worldEnglish
      1·
      5 hours ago

      That’s kind of curious. I don’t think 3D_FULLSCREEN should inherently determine idle mclk behaviour in and of itself. Is this just a single 1440p display at 120Hz? Is VRR enabled?