[Bug 95069] New: [DRI2][PRIME] display black window when enable GPU offloading

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95069

            Bug ID: 95069
           Summary: [DRI2][PRIME] display black window when enable GPU
                    offloading
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: qiang.yu at amd.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 123154
  --> https://bugs.freedesktop.org/attachment.cgi?id=123154&action=edit
Xorg log

Laptop: DELL
OS: Ubuntu 16.04
CPU + iGPU: Intel i5-6300U
dGPU: AMD R5 M255

Reproduce:
fresh install Ubuntu 16.04
$ DRI_PRIME=1 glxgears
the output window is black. change focus to other window will make
the window content.

But two situation works fine:
1. use modesetting DDX for intel iGPU
2. recompile Intel DDX with "--enable-debug=full"

GDB into DDX:
in sna_share_pixmap_backing(), priv->pinned is set, so return FALSE.
But when I step through sna_pixmap_move_to_gpu(), the priv->pinned is
not set. It seems some race condition happens.

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