An important part of the log I just sent seems to be: /var/log/syslog:
Dec 2 14:42:39 geode /usr/bin/dbus-launch[14011]: gnome-session-is-accelerated: llvmpipe detected. $ sudo journalctl /usr/sbin/gdm3 -- Logs begin at ke 2014-11-26 18:07:42 EET, end at ti 2014-12-02 14:45:29 EET. -- marras 26 18:08:51 geode gdm3[716]: Failed to give slave programs access to the display. Trying to proceed. joulu 02 14:42:37 geode gdm3[13991]: Failed to give slave programs access to the display. Trying to proceed. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/debian-bugs-dist