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[Launchpad Bug Tracker <422519@xxxxxxxxxxxxxxxxxx>]

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I'm using compiz with --indirect-rendering to avoid the black window bug
with nvidia proprietary drivers (x86_64 version 173.14.20).  When a
screensaver activates (I checked both with gnome-screensaver and
xscreensaver), Xorg eats approx. 70% CPU on an Athlon 64 3200+.  I have
the impression that this started since my dist-upgrade to Jaunty, but
can't really be sure.

Sending SIGSTOP to compiz.real makes Xorg stop eating that much CPU, so
it appears there's something wrong in the way compiz deals with the
fullscreen window of the screensaver.  I tried disabling every compiz
plugin, I also tried toggling the "unredirect fullscreen windows"
option, to no avail.

Of course, swithing off visual effects in appearance preferences makes
Xorg behave correctly.  It also seems that running compiz without
--indirect-rendering makes Xorg behave correctly, but then the black
window bug appears pretty quickly as I'm using Twinview on two 1600x1200
LCDs and my graphics card is a Quadro FX 500 with 128MB of ram.

I'm using Ubuntu 9.04 and AIGLX.

** Affects: linux-restricted-modules-2.6.24 (Ubuntu)
     Importance: Undecided
         Status: New

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Compiz makes Xorg+NVIDIA use lots of CPU while screensaver active
https://bugs.edge.launchpad.net/bugs/422519
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