Just after the session has died, look at /var/log/Xorg.0.log.old
You may need to Ctrl+Alt+F1 to switch to a console and view the log from there to avoid it being overwritten when you log in. (I can't recall whether the GDM session Xorg instance uses that file-name or not).
Just after the session has died, look at /var/log/ Xorg.0. log.old
You may need to Ctrl+Alt+F1 to switch to a console and view the log from there to avoid it being overwritten when you log in. (I can't recall whether the GDM session Xorg instance uses that file-name or not).