Can you attach the content of your /boot/firmware/config.txt?

I suspect it's lacking the vc4-fkms-v3d overlay which is now required as
of the pi4-compatible kernel (I'd originally, mistakenly, thought this
was only required on the pi4 but it turns out all pi models need it).
Tomorrow's dailies should have this change, and if you update to the
latest u-boot-rpi package it *should* migrate your boot configuration to
include this but otherwise you may need to manually add it in.

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  rpi3b+: corrupted screen on hdmi

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