I am also affected by this bug on a 2020 Lenovo laptop, same as OP reported. After an upgrade on my unstable debian system it booted only to a blinking cursor. Going into a terminal and checking logs I also saw the segmentation fault.
It made my laptop unusable as of now. :( Hope that the driver can be brought back or the hardware supported otherwise. This was also reported in #1025659 I'm happy to support you with information as much as I can. Xorg.0.log https://paste.debian.net/1263176/ Hardware info https://paste.debian.net/1263178/
