I'm experiencing the same problem, using the Classic Desktop without
effects. I'm not sure what gave rise to this problem, b/c my system
only started demonstrating this problem recently. I checked the output
of gnome-screensaver --no-daemon --debug and see the same thing as
Robert.
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You
I have experienced this problem as well, with an Intel 965 graphics kit.
I tried the mouse-polling fixes suggested here (I often use Logitech
USB mouse), but they didn't seem to make much of a difference for me.
Today this issue had deteriorated my desktop to near-unusability. My
uptime was 6
