[Bug 101926] kabini amdgpu: LVDS not working after resume from suspend (works with radeon)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101926

            Bug ID: 101926
           Summary: kabini amdgpu: LVDS not working after resume from
                    suspend (works with radeon)
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: chithanh at gentoo.org

Using Linux 4.12.3 on a netbook with AMD A4-1200 Kabini APU and the amdgpu
driver:

Upon resuming from suspend-to-RAM, the LVDS display will become all while.

This situation will persist until a reboot, even after turning it off and on
again with xrandr.

Backlight control works fine at all times. External displays (VGA, HDMI) are
not affected. The radeon driver does not have this problem.

I noticed that in bug 42960 a very similar issue was fixed in radeon, but am
currently unsure whether the fix made it into amdgpu too.

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