[Bug 93866] Tonga: Weston-drm direct scan out corruption

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93866

            Bug ID: 93866
           Summary: Tonga: Weston-drm direct scan out corruption
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: adf.lists at gmail.com

Created attachment 121287
  --> https://bugs.freedesktop.org/attachment.cgi?id=121287&action=edit
external picture showing corruption

Testing both release and git wayland/weston on R9285.

Using weston-launch from fbcon so it uses weston-drm.

Apart from https://bugs.freedesktop.org/show_bug.cgi?id=93740 which can be
worked around, rendering is good when compositing.

If I run something that allows weston to enable direct scanout there is slight
corruption. kodi and mpv are the only ways I know to do this.

If I do something that changes back yo compositing the corruption goes, taking
a screen shot/recording or zooming in will all "fix" the corruption.

I am inferring direct scan out is happening as I can't change transparency +
the man page for weston-drm says it will be used where possible.

Tried going back in time with mesa to see if it ever worked, but I started
hitting places where either weston wouldn't start or I always got compositing
so no corruption but I could change transparency.

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