I am seeing precisely this problem. The culprit in my case was a Cairo
clock with the seconds hand displayed. With that displayed on an
otherwise blank desktop, CPU use is negligible. If I then switch to
another user (without the clock), one CPU stays pegged at 100%. Removing
the Cairo clock from the first desktop solves the problem in this case
... but it reappears whenever /anything/ tries to update the desktop for
a non-active user.
As requested from the Other Guy, here are my compiz versions
compiz:
Installed: 1:0.8.2-0ubuntu8
Candidate: 1:0.8.2-0ubuntu8
Version table:
*** 1:0.8.2-0ubuntu8 0
500 http://gb.archive.ubuntu.com jaunty/main Packages
100 /var/lib/dpkg/status
compiz-core:
Installed: 1:0.8.2-0ubuntu8
Candidate: 1:0.8.2-0ubuntu8
Version table:
*** 1:0.8.2-0ubuntu8 0
500 http://gb.archive.ubuntu.com jaunty/main Packages
100 /var/lib/dpkg/status
compiz-gnome:
Installed: 1:0.8.2-0ubuntu8
Candidate: 1:0.8.2-0ubuntu8
Version table:
*** 1:0.8.2-0ubuntu8 0
500 http://gb.archive.ubuntu.com jaunty/main Packages
100 /var/lib/dpkg/status
In case it's of interest, I'm using an nVidia FX5200 and the proprietary
drivers:
nvidia-glx-173:
Installed: 173.14.16-0ubuntu1
Candidate: 173.14.16-0ubuntu1
Version table:
*** 173.14.16-0ubuntu1 0
500 http://gb.archive.ubuntu.com jaunty/restricted Packages
100 /var/lib/dpkg/status
--
Compiz lots of CPU to draw to an X display which is not even displayed (e.g.
after user switch)
https://bugs.launchpad.net/bugs/226194
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