[Bug 63383] [i915 vga output] glitchy output when attaching external monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63383

--- Comment #9 from Chris Wilson <chris at chris-wilson.co.uk> ---
So what I thought might have been happening was that we reused an incorrectly
sized cached framebuffer. Not so sure after reading i915_gem_framebuffer.
However, I've implemented a defense against using the wrong framebuffer size:

commit 9dae6f9f1f169c228929185a8bd94e82afe92574
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Apr 12 11:01:08 2013 +0100

    sna: Flush the scanout cache after resizing the display

    And ensure that any new scanout allocations make the requested size.

It will be worth updating xf86-video-intel.git and seeing if that makes any
difference (will be in ppa:xorg-edgers in a few hours).

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