External HDMI monitors detected intermittently on MacBook Pro about ddcctl

[adams-family]

I had a similar problem with a docking station (MacBook -> Thunderbolt -> Docking Station -> DisplayPort -> Display). In 19 cases out of 20 everything was working fine, then I just couldn't control the monitor via ddcctl until restart.

I simply returned the docking station and never had a problem ever since, not a single one. I know it might not solve your issue, just FYI.

[dfaulkner]

Absent the dock, how are you converting Thunderbolt to your external display?
I'll try to find a higher quality dock/adapter, but that will take a while.

[adams-family]

I'm using this guy: (I wanted a direct laptop-display cable instead of a cable + an adapter)

https://www.digitec.ch/de/s1/product/j5create-usb-30-type-c-to-4k-displayport-120m-display-port-usb-c-video-kabel-9894364

[dfaulkner]

I'm closing my original issue. After reporting this, I discovered my MacBook had hardware issues with its main logic board. After the repair, everything seems to work just fine.