This Saturday I decded to upgrade my Ubuntu Budgie 18.04 to 20.04… Dumb, I know, it was working fine with kernel 5.3.0 and nvidia-driver-435 (from the graphics driver PPA).
The upgrade went fairly well, apart from this issue:).
The behaviour is thus:
If using the Nouveau/intel OSS drivers, the machine can boot to display manager (tried gdm3, lightdm and sddm with all scenarios, same behaviour).
If using nvidia-driver-440 and “prime-select intel” has been run (does not work with gdm3, since it prevents the VTs to be managed by getty… Nowhere to log in) it will likewise reach/display the login screen (and allow a log in).
If using nvidia-driver-440 with “prime-select nvidia” or “prime-select off-load”, it will boot to the kernel splash screen. AFAICT it actually starts X, i can see the display manager and Xorg as consumers in nvidia-smi, but it seems (from reading a lot of Xorg logs) that no modelines are generated whatsoever!?nvidia-bug-report.log (2.3 MB)
I’m sure it is something silly, like a leftover config file or something… But I just can’t find it.
TIA for any help!