Although the row of corrupt pixels is fixed for me by the above package,
3d acceleration is now broken.  This message is present in Xorg.0.log,
and wasn't before: "(EE) AIGLX error: drmMap of framebuffer failed
(Invalid argument)(EE) AIGLX: reverting to software rendering".

In fact, glxgears is much slower than I would expect even for software
rendering, managing about 3fps with the default window size.  So slow
that it can't count: it reports 330 fps, but it's drawing about 3!  I
wasn't impressed by the X server crashing on the third run of glxgears
either.  (Could it be software renderer bugs are getting missed now 3d
users tend not to use it?)

So, the above package isn't a proper fix.  It may give clues to someone
about where to find the fix for the corrupt row of pixels.  Or, it may
be that whatever causes AIGLX to fail also marks the cause of corruption
now.

-- 
screen artifacts after resume, part row of pixels in error (945GM)
https://bugs.launchpad.net/bugs/91966
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