There's a race in chvt (see my comment at
https://bugs.launchpad.net/ubuntu/+source/kbd/+bug/1351564/comments/4)
which may be to blame. I suspect something on my system (Nvidia
driver?) is almost always winning this race, so chvt almost always
blocks and I can't suspend.
Perhaps pm-utils should use another more-reliable way of blanking the
screen?
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https://bugs.launchpad.net/bugs/1350220
Title:
hibernation fails because chvt hangs
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