Comment 37 for bug 110299

I guess it is the best to report it upstream. But there is one point. Could you please try to recreate the xorg.conf and test it again? Run "sudo dpkg-reconfigure xserver-xorg" and confirm all answers. You only have to check that the correct keyboard layout is chosen. Does it still happen with the new xorg.conf?
If so please use the Debian Sid driver and attach up-to-date files of /etc/X11/xorg.conf, /var/log/Xorg.0.log.old (past first reboot after the system has frozen) and the output of dmesg.