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This problem is very reproducible. Multiple SD cards with 2022-03-17_2022-01-28-fullpageos-bullseye-armhf-lite-0.13.0 and RPi4 4GB Rev 1.5. This combination gives me 25% of hard boots resulting in the black screen and lightdm.log...

I added some logging (for Display OK and Display not OK) to the script from Oliver and tested manually. Logging works fine. I added the sleep 15... line to the...

rc.local is thanks to systemd hobbled in bullseye. Enabling here https://blog.wijman.net/enable-rc-local-in-debian-bullseye/ the script above executes but the screen still stays black. I think my quick and dirty solution will be...