Comment 7 for bug 1238287

I am getting two different failure cases for this (see attached backtraces).

In the first case the failure happens when we are trying to unblank the display (may be related to ).

In the second case the failure happens when we try to commit a frame. I think this is the case caught by Michał originally, since it gives me the same unhelpful backtrace when crashing, and I had to catch the throw to get something more useful.