Comment # 4 on bug 1227068 from Tobias Burnus

Created attachment 875709 [details]
'glxinfo -B'  / 'lsmod | grep nvidia' | + after 'prime-select nvidia': glxinfo
-B

> Let's begin with X11.

For which I have less data as I used Wayland lately - and usually without any
external screen.

> prime-select get-current

# /usr/sbin/prime-select get-current
No driver configured.

# prime-select nvidia
nvidia catched
Preparing first configuration
NVIDIA modules are loaded
Logout to switch graphics

→ And, indeed, after the login, switching between the external display and the
internal one works (again? now?).