Since I don't see the intel driver in the backtrace, I went back to version 
2:2.1.1-0ubuntu5, so compiz is back again.
Then I tried to reproduce the backtrace in my last comment. With steps in 
comment #39, I was able to get the gray blocks in my second attempt.
gdb outptut attached.

** Attachment added: "gdb-X.txt"
   http://launchpadlibrarian.net/9861149/gdb-X.txt

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laptop hangs when switching video mode
https://bugs.launchpad.net/bugs/127101
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