Samsung C24F390 - DDC communication failed

[octvs]

Hey there,

I can't get ddcutil to run on my monitor that is connected to a docking station.

Setup:

• Samsung Monitor C24F390
• ThinkPad Universal ThunderBolt 4 Dock

The monitor is connected in the following fashion:

Monitor --(HDMI)--> KVM switch --(HDMI)--> Dock --(USB-C)--> Laptop

This might be related to #140, but also other issues related to docking stations however I wasn't able to dig my way out of them. My apologies in case I should have done dig better/deeper.

The result of the interrogate is attached.

ddcutil-interrogate.txt

[rockowitz]

If it were me I'd try to isolate the problem by testing one connection at a time, e.g.:

• laptop HDMI connector to monitor
• laptop USB-C connector to monitor (Thunderbolt type-C connectors support DisplayPort dual mode)
• laptop HDMI to KVM switch to monitor
• laptop HDMI to dock to monitor (no KVM)