Comment # 2
on bug 67178
from Tomas Pospisek
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
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