[Bug 98324] amd-staging-4.7: problems with unblanking displays when monitors are switched off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98324

            Bug ID: 98324
           Summary: amd-staging-4.7: problems with unblanking displays
                    when monitors are switched off
           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: bugspam at moreofthesa.me.uk

Created attachment 127405
  --> https://bugs.freedesktop.org/attachment.cgi?id=127405&action=edit
Kernel log extract, showing the unblanking failure.

Setup: RX 470 with two monitors attached – one via DVI-and one via HDMI. (Both
are AOC monitors.)

* Ensure that outputs are blanked (via xset, time-out or similar).
* Switch off the monitors.
* Unblank the outputs.
* Switch on the monitors.

Invariably, in this situation, the DVI-connected monitor is unblanked and
displaying what it should be, but the HDMI-connected monitor is receiving no
signal (or at least nothing to display) and is therefore displaying nothing.

The HDMI-connected monitor can be restored by using xrandr to change mode or by
blanking and unblanking – so long as it's switched on while doing so.

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