Thanks, Tom!
Nic R

Hey Nic! Thanks for the notes on your experience with 18.04 — very interesting to know that going back to the 4.13.10 kernel did the trick for you… I had a play with updating the 18.04 the other day but ended up rolling back to 17.10 for the moment, the nvidia-prime package has changed how prime-select works that causes some hassles, that might have been what you encountered!