[Bug 67015] New: Page rendering corruption in Firefox [SNA]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67015

          Priority: medium
            Bug ID: 67015
          Assignee: chris at chris-wilson.co.uk
           Summary: Page rendering corruption in Firefox [SNA]
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: linuxhippy at gmail.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

Created attachment 82566
  --> https://bugs.freedesktop.org/attachment.cgi?id=82566&action=edit
screenshot

When viewing the page https://bugs.kde.org/show_bug.cgi?id=224447 on my SNB
laptop with the official FF-22 build I get page corruptions when another window
is on top of Firefox.

Steps to reproduce:
1. Load https://bugs.kde.org/show_bug.cgi?id=224447 in Firefox
2. Scroll to bottom
3. Move/Open window on top of the FF window

Quite often the page is already corrupted after scrolling to the bottom.

I did some bisecting, however I am not really convinced its really the commit
to blame: 

48028a7c923fa0d66b01e8e94d4f0742866f78ec is the first bad commit
commit 48028a7c923fa0d66b01e8e94d4f0742866f78ec
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Jun 21 14:29:43 2013 +0100

    sna: Inspect availablity of render before prefering to use the GPU

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

:040000 040000 f56e8b2d4e7c6fdd77080ac66437e56fa6cd3938
a3ba69294e46d078d94dd5f6ad976ec6eaccbfb2 M    src

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