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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