After update today system don't start with 5.11.0-34-generic. Freeze on KDE Neon 5.22.5 logo. Boot with 5.11.0-27-generic is normal.

Updated packages:

- alsa-ucm-conf-1.2.2-1ubuntu0.10.all
- thermald-1.9.1-1ubuntu0.6.amd64
- linux-modules-5.11.0-34-generic-5.11.0-34.36~20.04.1.amd64
- linux-image-5.11.0-34-generic-5.11.0-34.36~20.04.1.amd64
- linux-modules-extra-5.11.0-34-generic-5.11.0-34.36~20.04.1.amd64
- linux-generic-hwe-20.04-5.11.0.34.36~20.04.13.amd64
- linux-image-generic-hwe-20.04-5.11.0.34.36~20.04.13.amd64
- linux-hwe-5.11-headers-5.11.0-34-5.11.0-34.36~20.04.1.all
- linux-headers-5.11.0-34-generic-5.11.0-34.36~20.04.1.amd64
- linux-headers-generic-hwe-20.04-5.11.0.34.36~20.04.13.amd64
- linux-modules-5.4.0-84-generic-5.4.0-84.94.amd64
- linux-image-5.4.0-84-generic-5.4.0-84.94.amd64
- linux-modules-extra-5.4.0-84-generic-5.4.0-84.94.amd64
- linux-image-generic-5.4.0.84.88.amd64
- linux-libc-dev-5.4.0-84.94.amd64

systemctl show ssdm don't start:

16:51:04 linux-pc sddm[1397]: Initializing...
16:51:04 linux-pc sddm[1397]: Starting...
16:51:04 linux-pc sddm[1397]: Logind interface found

Nothing failed.

Boot with 5.11.0-27:

16:53:44 linux-pc sddm[1402]: Initializing...
16:53:44 linux-pc sddm[1402]: Starting...
16:53:44 linux-pc sddm[1402]: Logind interface found
16:53:44 linux-pc sddm[1402]: Adding new display on vt 1 ...
16:53:44 linux-pc sddm[1402]: Loading theme configuration from ""
16:53:44 linux-pc sddm[1402]: Display server starting...

Operating System: KDE neon 5.22
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.3
Graphics Platform: X11
Graphics Processor: NVIDIA GeForce GTX

Fixed after last update today. May be nvidia-driver-470 is the problem.