https://bugs.freedesktop.org/show_bug.cgi?id=75992

--- Comment #20 from nicolas.laplante@gmail.com ---
Just to add my 2c to this issue: if I set radeon.dpm=0 on the command line, the
card defaults to the "profile" power method.

If I try to:

echo "high" > /sys/class/drm/card0/device/power_profile

the screen goes black and I have to shut down using the power button
(Ctrl+Alt+Del doesn't even work).

This happens both while on the desktop or in another vt.

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