Alex Deucher 73acacc739 drm/radeon: don't allow runpm=1 on systems with out ATPX
vgaswitcheroo and the ATPX ACPI methods are required to
power down the dGPU.

bug:
https://bugzilla.kernel.org/show_bug.cgi?id=73901

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
2014-04-22 16:51:21 +02:00
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