As Andy predicted, the abovementioned patch is included upstream in
kernel 2.6.38-rc5. From the changelog:
commit 72389a33b8878e6091f7ab8080f5ed07054c7c39
Author: Chris Wilson
Date: Sun Feb 6 15:50:52 2011 +0000
drm/i915/lvds: Restore dithering on native modes for gen2/3
A regression introduced in bee17e5 cleared the dithering bit for native
modes on gen2/3.
Bugzilla: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/711568
Signed-off-by: Chris Wilson
A PPA of this kernel is available at http://kernel.ubuntu.com/~kernel-
ppa/mainline/
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https://bugs.launchpad.net/bugs/711568
Title:
Dithering regression on Intel graphics with .38 Natty kernel
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