Hya,
to whom it may concern.
my systems: Debian squeeze up to date. (32 bit Aspire one and 64 bit Atom)
symptom GLknots, one of xscreensaver kills X session. Entire screen got blank, keyboard and mouse do not work at all. Killing parent shell via ssh does not solve. So far, only restarting entire system works.
log
Fatal server error:
Failed to submit batchbuffer: Input/output error
Please consult the The X.Org Foundation support
at
http://wiki.x.org
for help.
Please also check the log file at "/var/log/Xorg.0.log" for additional information.
(II) Power Button: Close
(II) UnloadModule: "evdev"
(II) Video Bus: Close
(II) UnloadModule: "evdev"
(II) Power Button: Close
(II) UnloadModule: "evdev"
(II) Sleep Button: Close
(II) UnloadModule: "evdev"
(II) PIXART USB OPTICAL MOUSE: Close
(II) UnloadModule: "evdev"
(II) USB 2.0 Camera: Close
(II) UnloadModule: "evdev"
(II) AT Translated Set 2 keyboard: Close
(II) UnloadModule: "evdev"
(II) ACPI Virtual Keyboard Device: Close
(II) UnloadModule: "evdev"
(II) AIGLX: Suspending AIGLX clients for VT switch
workaround disable GLknots