Bug#1025659:
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 #1025389
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/
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