I was experiencing this same issue on the dell mini 9. It seemed that it
was working again with the compiz/unity updates (minus that every now
and then the image on the screen would freeze indefinitely whilst the
cursor would still move - required a reboot to work again). Having
installed the latest mesa update however
(9.0~git20120903.e1673d20-0ubuntu1), after entering my password in the
login screen I am left with a black screen with a cursor that can move
as normal. Top shows that compiz and the usual desktop processes are
running normally. This may be a different bug, but downgrading the three
mesa packages mentioned above at least allows unity to load. I still
have sporadic issues with the image freezing indefinitely. Are others
seeing similar things, or am I best opening a new bug?

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which is subscribed to mesa in Ubuntu.
https://bugs.launchpad.net/bugs/1042211

Title:
  [quantal] [regression] [i915] Corrupted display, desktop and menus
  don't repaint correctly using Mesa 9.0 (8.0.4 works)

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