Hello all, and also, Happy New Year ! I believe I have the same issue and I also have hybrid graphics. On boot, when using fglrx display drivers, gdm shows a black screen (when I should have the login screen). I have no error in /var/log/Xorg.0.log (except a segmentation fault when I stop gdm).
As I can run graphical hardware accelerated applications using a dedicated Xorg instance, I think the problem is gdm related. In fact I think your bug (and mine) is a duplicate of #745901 <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=745901>. Mathieu, can you run the following tests ? Using fglrx driver, gdm not running, run this command from a random tty as a normal user (= not root) : /usr/bin/xinit /usr/bin/chromium Instead of chromium, you can try other graphical application. I was succesfull with chromium, steam (and even running games) and kodi (=xbmc). This test should work correctly. Then try running the same test with a gnome application which depends on clutter (like totem). /usr/bin/xinit /usr/bin/totem If it gives you the following error, then your bug, is a duplicate of #745901 <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=745901>. (gnome-shell:3461): GLib-CRITICAL **: g_strsplit: assertion 'string != NULL' failed (gnome-shell:3461): Clutter-CRITICAL **: Unable to initialize Clutter: The OpenGL version could not be determined Erreur du gestionnaire de fenêtres : Unable to initialize Clutter. Thanks
