HI,
I think I am facing the same root cause.
Since the update last week if Nvidia driver are install I am having issue booting or even displaying the login page.
I also enabled autologin but it doesn't work anymore after the latest sync from last week
I have a XMG P705 - I7 5700HQ - GTX 980M.
I am using Solus OS 4.5 budgie
I also did a fresh install same issue after doing the updates
When I remove the NVidia driver the issue is gone.
Edit 1 :
This is happening with all version of the NVidia driver (current/Beta/Developers). There is something in the update that broke the display/login into the OS.
Edit 2 :
This is also happening on Solus OS KDE version