Created attachment 917584 [details]
Description of problem:
If I append radeon.dpm=1 to the kernel at boot time, 3d acceleration is affected.
It prevents GDM, KDM or XDM to work. The only one that seems unnaffected is LightDM since it doesn't use it.
It makes it impossible to use Gnome, KDE or any 3d accelerated desktop.
Version-Release number of selected component (if applicable):
Use radeon and enable dpm. Reboot a few times. Most of the time, gdm will not work at all (it works sometimes).
Remove it and it will work.
This problem happens begining kernel 3.14.x until today; 3.15.3 at the moment.
If I don't use dpm, my video card starts overheating. I can't even get passed installation if it is not enabled.
The only fix I have left is the following, but it makes my graphics clumsy:
echo profile > /sys/class/drm/card0/device/power_method
echo low > /sys/class/drm/card0/device/power_profile
Created attachment 917585 [details]
Created attachment 917586 [details]
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