Is it HDMI from the board to HDMI on the monitor? I'd like to rule out any use of an adapter or HDMI-to-DVI cable.
What monitor is this?
Is the monitor detected?
What do you see in the 'status', 'enabled', 'dpms', and 'modes' files in /sys/class/drm/card0-HDMI-A-1/ ?
Is it HDMI from the board to HDMI on the monitor? I'd like to rule out any use of an adapter or HDMI-to-DVI cable.
What monitor is this?
Is the monitor detected?
What do you see in the 'status', 'enabled', 'dpms', and 'modes' files in /sys/class/ drm/card0- HDMI-A- 1/ ?