[Bug 96699] New: Missing framebuffer copy for flicker-free startup

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96699

            Bug ID: 96699
           Summary: Missing framebuffer copy for flicker-free startup
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/AMDgpu
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: dan at reactivated.net
        QA Contact: xorg-team at lists.x.org

A standard setup for a linux distro is for plymouth to launch X and gdm.
Currently when booting there is a flicker at the time when X launches.

There is a carefully done handoff there between the two, where plymouth drops
the drm master and them gdm takes it, etc. But for flicker-free boot this does
rely on the X driver starting up with the same framebuffer contents as what was
seen before.

For example,
https://github.com/endlessm/xf86-video-armsoc/commit/7f15fa47b6c35b154cbb39bb6145025b51af401c

It would be great if this could be implemented in amdgpu.

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