I’m using 346.59 drivers for Kubuntu 15.04 with a Quadro K1100M card.
When I switch through prime-select from intel to nvidia, then after booting I randomly get a black screen about 50% of the times. I can’t but switch to a virtual console by pressing [Ctrl+Alt+Fn] and then reboot. If I’m lucky, then the normal Kubuntu login screen appears, otherwise I get yet another black screen and have to reboot again.
output of nvidia-bug-report.sh follows
nvidia-bug-report.log.gz (198 KB)