High X memory bugs are almost always caused by a runaway client program.
There's nothing in any of the files you attached to suggest it is really
an X bug.
You seem to have a number of non-standard software installed like
virtualbox and chrome. Do a bit more analysis into what applications
are running when this bug happens and try killing them off one by one.
** Changed in: xorg (Ubuntu)
Importance: Undecided => Low
** Changed in: xorg (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/780424
Title:
Xorg unresponsive after screensaver unlock with Dual Head
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