Force HDMI output on RockPi4

[awneil]

Interesting. I have a Rock 4C+ which, for some reason, just stopped outputting HDMI:

Rock-4C+ HDMI stopped working

I’ve had it for a couple of months, working fine. This afternoon, the HDMI just stopped working. It’s as if the Desktop went to sleep, but now can’t see any wakeup signals (mouse movement, KB) - even though the mouse & KB are clearly working. I can still login via SSH. Full details here: https://www.rs-online.com/designspark/rock-4c-hdmi-stopped-working Is it broken? What other tests can I do?

So far nobody’s come up with any ideas on why or how to diagnose it - so would be interested to hear if you find anything…