We reverted the RPi4 firmware back from the July 2 version kernel: Bump to 5.4.50 · raspberrypi/firmware@66fc5ea · GitHub to the June 26 version kernel: Bump to 5.4.49 · raspberrypi/firmware@2b76cfc · GitHub as the added support for interlaced modes was incomplete and caused the black screen issues with TVs that flag interlaced (eg 1080i50/60) as the preferred mode in their EDID. See also the github issue [BUG] · Issue #4523 · LibreELEC/LibreELEC.tv · GitHub
so long,
Hias