works
- Macbook → USB C/ DP → monitor
- Macbook → thunderolt dock → USB C/DP → KVM → DP/DP → monitor
- Macbook → thunderbolt dock → miniDP/DP → KVM → DP/HDMI → monitor
- macbook → thunderbolt dock → USB C/HDMI → HDMI/HDMI → monitor
does not work
- Macbook → thunderbolt dock → USB C/DP → KVM → DP/HDMI → monitor
- Macbook → USB C/DP → KVM → DP/HDMI → monitor
this is the only setup that works. Switch any single cable and it doesn't.