[Bug 68410] New: [bisected ivb] Small black box corruption in firefox

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68410

          Priority: medium
            Bug ID: 68410
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [bisected ivb] Small black box corruption in firefox
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: joe.yasi at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 84420
  --> https://bugs.freedesktop.org/attachment.cgi?id=84420&action=edit
screenshot of corruption black boxes

I bisected the corruption down to commit
ed40a7c3de3bbb178278c05907e59239712b98b6: sna/gen6+: Tweak semaphore avoidance
for composite operations. I get small black boxes when scrolling in Firefox on
a page with a lot text as of this commit. This page reproduces it pretty
readily:
http://www.nola.com/politics/index.ssf/2013/08/polls_show_louisianians_disapp.html.

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