I filed a report about similar behavior a few days ago when upgrading
from ibex to jaunty and then to karmic, where my screensaver stopped
working correctly.  Running gnome-screensaver in debug as you did, I see
no events at the one minute mark, which the timeout is set to.  Using
gnome-screensaver-command -a as you did put my screensaver into proper
fade out as I'd expect at the timeout, without the error.

One thing I did notice is restarting gnome-screensaver in debug, while
waiting for the screensaver to kick in, all of a sudden I did get a DMPS
shutdown of the screen, which hadn't occurred at the timeout interval
either.  I had upgraded yesterday to an updated build of gnome-power-
manager (2.27.5-0ubuntu2) supposedly resolving the timeout issue, but
did infact not.  I did restart it, but not gnome-screensaver, so at
least DMPS seems to be behaving, still not gnome-screensaver.

I think the two are somehow related, but I'm not certain if gnome-
screensaver and gnome-power-manager use the same event engine
(hal,dbus?) to signal "idle" state, or from xorg itself that may be
broken.  Seems gnome-screensaver just isn't figuring itself to ever go
idle, while they fixed whatever it was in GPM.  Now that I just tested
the DMPS timeout again, I see it's not working again either.

FWIW, another system recently upgraded to Jaunty has variable issues
with gnome-screensaver  not always turning on at the set timeout as
well, really almost random when it works or doesn't.  Almost exactly the
same output as this one on karmic.

-- 
gnome-screensaver not functioning
https://bugs.launchpad.net/bugs/411350
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