Ok, I solved the problem : apparently the brightness of the second display was incorrectly set...
I used sleep 1 && xset dpms force off As indicated here : https://wiki.archlinux.org/index.php/backlight And my display restarted... Thanks anyway. Braud -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1416927 Title: Built-in display no longer working [GTX765M] [Alienware 15] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-331/+bug/1416927/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs