[Bug 65099] New: [GM45] Video corruption on wide desktop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65099

          Priority: medium
            Bug ID: 65099
          Assignee: chris at chris-wilson.co.uk
           Summary: [GM45] Video corruption on wide desktop
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: freedesktop-bugs at PaulSD.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

I have a ThinkPad laptop with a GM45 chipset that I connect to two external
monitors via a Matrox DualHead2Go box.

I recently upgraded from Ubuntu Precise to Raring.  After the upgrade, if I
enable the external monitors using `xrandr --output VGA1 --mode 3840x1200
--right-of LVDS1` or `xrandr --output VGA1 --mode 3840x1200 --left-of LVDS1`,
the external monitors turn on, but the entire screen (including LVDS1) is
corrupted.

Using '--above' or '--below' instead of '--right-of' or '--left-of' does not
cause screen corruption.  Reverting xserver-xorg-video-intel from
2.21.6-0ubuntu4 to 2.20.9-0ubuntu2.1 without making any other changes fixes the
problem (I can use '--right-of' or '--left-of' again without screen
corruption).

I'll submit additional information as I collect it.

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