You've got some weird wireless error messages in your dmesg.
Anyway, this sounds more like a power manager issue than X. X failures
generally don't result in zombie processes, that sounds more like
plumbing layer misbehavior.
Also I notice you have VirtualBox installed, which could cause problems:
[ 4177.752515] warning: `VirtualBox' uses 32-bit capabilities (legacy
support in use)
Anyway, not looking likely to be an X issue. Reopen if you can narrow
to a test case that demonstrates something X specifically is failing on,
or error messages in an X log or something.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/768581
Title:
Unity froze when anything else went fullscreen (even screensaver) for
more than 30 minutes
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