(In reply to Egbert Eich from comment #3) Please remember I had created my 99-local.conf below /etc/X11/xorg.conf.d/ accordingly to the documentation I've found at nvidia: https://a248.e.akamai.net/f/248/10/10/us.download.nvidia.com/XFree86/Linux-x86/319.12/README/installationandconfiguration.html Compare with the configuration for bug #960574 ... without the modesetting there is no composite configuration possible which results in a black screen. With the configuration in attachment #660731 [details] is *was* possible to switch the virtual consoles as well as suspend or hibernate and resume the system. I had also tried an empty configuration with Option "AllowEmptyInitialConfiguration" but this does not work and cause a hanging nvidia X11 driver. Also with 352.79 I had to add the Option "MetaModes" "DFP-0:1920x1080+0+0" in Section "Device" for nvidia and Section "Screen" as otherwise the nvidia driver shows lines like ... (II) NVIDIA(0): Setting mode "NULL" in the log.