This is a Thinkpad T460p running vanilla PopOS (few extensions but no other customisation) 20.04LTS fully updated.
The 5.8 kernel update came through Pop Shop as per usual, installed, rebooted and the screen goes straight to powersave. The laptop does not boot (no net/ssh access or dhcp request).

The laptop boots again if I remove the "quiet" option from the kernel line (either at boot or at the entry in /boot/efi/loader/entries).

No idea why but this is very weird. Thanks.

Dmesg output (after quiet disabled, not of failed boot).
https://pastebin.com/VS3nK4ct