https://bugs.freedesktop.org/show_bug.cgi?id=67178
--- Comment #2 from Tomas Pospisek tpo_deb@sourcepole.ch --- So if I boot with "radeon.dpm=1" then, as allready described, the laptop uses "relatively little" power, and is faning off some heat continuously, even when I set:
# echo "battery" > /sys/class/drm/card1/device/power_dpm_state
Whether I do the following does *not* seem to matter:
# echo IGD > /sys/kernel/debug/vgaswitcheroo/switch # echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
But if I boot *without* "radeon.dpm=1" then the laptop will stay cool without fans running out of the box using around 14W.
The various settings will show this then:
# cat /sys/class/drm/card1/device/power_method dpm # cat /sys/class/drm/card1/device/power_profile default # cat /sys/class/drm/card1/device/power_dpm_state balanced
Weird that power_method would show "dpm" even though I have booted *without* "radeon.dpm=1" ?!
When I then set:
# echo "battery" > /sys/class/drm/card1/device/power_dpm_state
Power consumption will drop even further to ~11W.
The overal logic of all of this is evidently completely escaping me... 8-o