Reopening since, unfortunately, I'm still able to reproduce this bug.
Steps to reproduce:
1. Disable desktop effects and enable desktop effects again.
2. Switch to VT1 and switch back to VT7.
3. Repeat steps 1 and 2 several times.
This bug is different than bug #141063. In the other bug, it was just a freeze,
and I was able to get a backtrace through ssh.
In this gray blocks hang bug, I'm not able to get a backtrace since once the
laptop hangs not even networking works.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Fix Released => Confirmed
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laptop hangs when switching video mode
https://bugs.launchpad.net/bugs/127101
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