[Bug 77368] New: [SNA] Garbage in window after filling backbuffer with glDrawPixels on Mesa-10.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77368

          Priority: medium
            Bug ID: 77368
          Assignee: chris at chris-wilson.co.uk
           Summary: [SNA] Garbage in window after filling backbuffer with
                    glDrawPixels on Mesa-10.1
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: amonakov at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

Created attachment 97258
  --> https://bugs.freedesktop.org/attachment.cgi?id=97258&action=edit
reproducer

Starting from 10.1 release, Mesa/i915 has a blit fastpath for glDrawPixels.  It
seems to not work properly for some, but not all, users, instead producing a
black window or a window showing contents from elsewhere on the screen.  I've
been unable to reproduce it on my hardware.

Software versions on which the problem is observed: Xorg 1.15, xf86-video-intel
2.99.911, Mesa 10.1

So far it's known that UXA is not affected; with SNA: IVB and HSW are affected.

A few users affected by the problem are gathered at
https://github.com/amonakov/primus/issues/138; since I couldn't reproduce the
problem I'll encourage them to add themselves to CC here. 

A test case is attached.  It expects the number of frames to draw as the first
argument (./a.out 1000).

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