running Squeeze, with Xorg and latest kernel - the chipset is an Intel 965.
[ A ] : My first suspicion would be a crash of the X server with a subsequent automatic restart of gdm. Do you see signs of an X server restart or anything else that looks suspicious in /var/log/Xorg.0.log or /var/log/Xorg.0.log.old or /var/log/syslog? Does your screensaver of choice use fancy accelerated graphics which could trigger bugs in your video driver that crash the X server ?
[ B ] : See also the ~/.xsesssion-errors
[ C ] : Fatal server error: Failed to submit batchbuffer: Input/output error
That is a problem with the video driver; your GPU is choking on a set of instructions that it is supposed to execute. Which video chipset do you use, which version of the X server and which kernel ? ( An Intel 845 series chipset with Sid's Xorg and kernel, maybe? )
[ D ] : The other approach is to downgrade the intel driver to the last version that works for your card.
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