Please refer to
https://forums.opensuse.org/t/issues-with-kernel-6-11-0-1-default-and-nvidia-drivers/178932

Symptom:
The nvidia driver has a bug (fixed upstream in 550.120) which causes the fbdev
interface to fail.
KDE's kwin (apparently?) was using this interface.
This meant that kwin would fail after the kernel update, resulting in a
mostly-unresponsive system.

Workaround:
A workaround for this has been found, which is to enable kernel modesetting for
the driver, using the kernel boot parameter nvidia_drm.modeset=1

The real problem:
However, this should not be necessary, and for many users was not necessary,
since the driver package installs a file to
/usr/lib/modprobe.d/50-nvidia-default.conf, which specifies this option for
this kernel module.

All of this suggests that there is a fault in this driver package, which was
hidden, and was exposed by the driver bug. If the modprobe conf file were
functioning, then the module should have been loaded with the parameters it
specifies, and the DE would load.

We have a workaround, and future drivers will successfully work without the
modprobe conf files, but it would be good to make sure the modprobe conf files
actually work 100%. We presently have no clue as to why some users were
uneffected by this.