(In reply to Tobias Burnus from comment #4) > Created attachment 875709 [details] > 'glxinfo -B' / 'lsmod | grep nvidia' | + after 'prime-select nvidia': > glxinfo -B Looks good. OpenGL renderer string: NVIDIA RTX A1000 6GB Laptop GPU/PCIe/SSE2 > → And, indeed, after the login, switching between the external display and > the internal one works (again? now?). See above. So both monitors are working now? Check with xrandr -q