What video driver and graphics card are you using?
Are you using Ubuntu, Kubuntu or another flavour?
Does the screensaver kick in or does the desktop get locked, before CPU climbs
up?
If CPU is at 100% can you switch to a virtual terminal (ctrl-alt-F1) (or ssh to
your machine) and attach gdb to the Xorg process? ("gdb -p
PID_OF_XORG_PROCESS"). To make this useful, you should install the debug
symbols (xserver-xorg-core-dbgsym at least).
Please refer to https://wiki.ubuntu.com/X/Debugging for any other information
that may be interesting.
(btw: I've found two similar bugs: bug 98668 and bug 61250)
** Changed in: xorg (Ubuntu)
Assignee: (unassigned) => dAniel hAhler (blueyed)
Status: New => Incomplete
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Xorg climbs to 100% and locks up idle system
https://bugs.launchpad.net/bugs/157756
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