[Bug 101499] Black screen when detaching HDMI cable (AMD A10-9620P)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101499

            Bug ID: 101499
           Summary: Black screen when detaching HDMI cable (AMD A10-9620P)
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: carlo at caione.org

Created attachment 132061
  --> https://bugs.freedesktop.org/attachment.cgi?id=132061&action=edit
journal_from_boot_to_HDMI_cable_detaching

We are working with new laptops that have the AMD Bristol Ridge
chipset with this SoC:

AMD A10-9620P RADEON R5, 10 COMPUTE CORES 4C+6G

When the HDMI cable is attached and then detached, the internal panel goes
black and the only way to have it back is switching to another TTY and then
back to xorg or doing 'xset dpms force off; xset dpms force on'.

This is reproducible also on the ~agd5f/drm-next-4.13-wip branch.

In the attachment the whole journal when booting the kernel compiled from
~agd5f/drm-next-4.13-wip, landing in xorg and then attaching and detaching the
HDMI cable.

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