Comment 45 for bug 1369216

Dell Alienware 17R3 w/Sky Lake, nVidia GTX 970M and Intel HD530 with prime-select set to nVidia. Running Ubuntu 16.04.3 LTS with a laptop screen plus HDMI external screen plus HDMI external screen (via Thunderbolt 3 Displayport to HDMI adapter).

From /var/log/syslog today:

Nov 26 13:33:12 alien lightdm[1093]: /etc/modprobe.d is not a file
Nov 26 13:33:12 alien lightdm[1093]: message repeated 4 times: [ /etc/modprobe.d is not a file]
Nov 26 13:33:12 alien systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
Nov 26 13:33:12 alien systemd[1]: lightdm.service: Unit entered failed state.
Nov 26 13:33:12 alien systemd[1]: lightdm.service: Triggering OnFailure= dependencies.
Nov 26 13:33:12 alien systemd[1]: lightdm.service: Failed with result 'exit-code'.
Nov 26 13:33:12 alien systemd[1]: Starting Clean up any mess left by 0dns-up...
Nov 26 13:33:12 alien systemd[1]: Started Run anacron jobs.
Nov 26 13:33:12 alien systemd[1]: Stopped target Graphical Interface.
Nov 26 13:33:12 alien mkdir[1163]: /bin/mkdir: cannot create directory ‘/var/run/pppconfig’: File exists
Nov 26 13:33:12 alien systemd[1]: Starting Restore /etc/resolv.conf if the system crashed before the ppp link was shut down...
Nov 26 13:33:12 alien anacron[1164]: Anacron 2.3 started on 2017-11-26
Nov 26 13:33:12 alien anacron[1164]: Normal exit (0 jobs run)
Nov 26 13:33:12 alien systemd[1]: dns-clean.service: Control process exited, code=exited status=1
Nov 26 13:33:12 alien systemd[1]: Failed to start Clean up any mess left by 0dns-up.
Nov 26 13:33:12 alien systemd[1]: dns-clean.service: Unit entered failed state.
Nov 26 13:33:12 alien systemd[1]: dns-clean.service: Failed with result 'exit-code'.