Nvidia driver updates break things all the time. Just rollback and wait a few weeks before you try updating again.
The 545 drivers are very buggy, at least for me. I downgraded to 535,hopefully we get an usable 545 soon. Also, if you feel like it you can report the issue in the nvidia forums, it might get some visibility there.
The new kernel driver 545 is constantly throwing error on cold boot. It will reach a workable desktop though.
If I reboot after the cold boot, the driver loads normally without error.
This is the first time I see information at startup about the nVidia driver loading.
Edit: I'll just buy a AMD card next time and be done with this crap.
Also on a side note, I can't even logon to a Wayland session, like ever. The desktop is black with only the cursor and after a couple of seconds Kwin always crashes.
I'll stay on x11 for now.
Open a X terminal, and type: nvidia-settings
Go to the screens menu, disable the monitor, accept, enable it again and accept...
Happened on mines, a 200Hz one and it worked!
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