Comment 4 for bug 232026

Is it possible to get a backtrace when the system freezes completely?

I tried to follow the directions on http://wiki.ubuntu.com/X/Backtracing. After booting the system with Driver "i810" in xorg.conf to avoid the system hanging at boot, I ssh'ed in from another computer, stopped gdm (/etc/init.d/gdm stop), changed the driver to "intel" and started "gdb /usr/bin/Xorg". At the gdm prompt, I entered "run -keeptty -dumbSched". After a few lines of output from Xorg, the system froze completely, including the network connection going down, so it was impossible to enter "backtrace full". I have attached the output on screen from editing xorg.conf until the system freeezes. Did I do anything wrong?

Would it be helpful to have the ouptut of "strace /usr/bin/Xorg -f -oOutfile" or simlilarly with ltrace? This seems to hang even when I use the i810 driver, but the system doesn't freeze completely then (I can still ssh in).