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.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1847596 Title: rpi3b+: corrupted screen on hdmi To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1847596/+subscriptions -- ubuntu-bugs mailing list firstname.lastname@example.org https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs