Public bug reported:
Binary package hint: compiz
Description:
After switching to second user (who is using metacity, of course), compiz.real
uses lots (20-100%) of CPU drawing. This only happens when the display compiz
is running on (:0 for me) is NOT actually what's being output. Secondly, this
only occurs if something is updating on the compiz screen (e.g. htop maximized
is real bad). This does include the lock screen (which displays completely
white for me, though I can guess where the password box is via cursor; probably
an unrelated bug) Note that prior to the user switch CPU usage is basically
none (<1.5%).
Workaround:
Switch to a blank desktop before the user switch. This pins CPU usage at about
5%. Probably if I removed system monitor applet, clock, etc. the usage would
be the same.
My System:
Stock hardy w/ current nvidia-glx-new. First user uses dual monitors in
Twinview configuration, second user uses TV/laptop screen in Twinview
configuration.
** Affects: compiz (Ubuntu)
Importance: Undecided
Status: New
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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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