This happens me too.
Always reproducible, steps:
a) start computer
b) verify that Xorg is using some 0.7% CPU
c) lock the screen
d) login back
-> Xorg uses 97 ... 105% CPU
Wait over ten minutes and it will not cool down.
('sudo killall Xorg' helps)
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Step c) could be suspend/hibernate too, because they implies screen locking.
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Also changing to the tty (i.e. ctrl-alt-f1) triggers xorg to use ~100% CPU.
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Virtualbox mentioned earlier: I have virtualbox installed, but not running
('lsmod | grep vbox' gives hits).
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1313275
Title:
relogin fails with black screen, Xorg high load
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