From 73acacc7397fe854ed2ab75f1c940fa00faaf15e Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexdeucher@gmail.com>
Date: Tue, 15 Apr 2014 12:44:35 -0400
Subject: [PATCH] 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
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