Btw, make sure to restart X (e.g. `sudo service gdm restart` would do
it).  I found this resolved the white screen issue, but it is possible
there are subsequent usage issues.

Mark, some further info I've gleaned.  The root cause here actually is
not a bug in X, but rather that clutter has been depending on a bug in
mesa which was fixed in mesa 7.9.  My bisection work actually just
restored the buggy code that clutter depends on.

The proper fix is to fix Clutter...  Specifically
https://bugs.edge.launchpad.net/ubuntu/+source/clutter-1.0/+bug/632352
needs to be resolved.

As I understand the bug, Mesa 7.8 would spam event notifications to all
clients regardless of whether they wanted them.  Clutter used this to do
its updates.  In Mesa 7.9, it changed to only send notices to clients
that registered interest in them.  Since clutter doesn't register
interest, it doesn't get updated, so you just see a white screen.  The
patch in bug #632352 enables clutter to request these updates.  The
"fix" I uploaded causes mesa to resume its old spammy behavior.

-- 
No unity board but White screen after GDM
https://bugs.launchpad.net/bugs/638808
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