External dock Screen On/OFF Issue

[kuitog]

Hi, When plugging a LG TV C4 monitor in the mac hdmi port: the screen correctly turns on/off at the screensaver timeout/wake.

The problem: I am now using a dock from cablematters (201310) to handle 120hz via usb-c.
This dock somehow doesn't send the on/off signal to the display via hdmi.

Is there any workaround I can apply via betterdisplay?

I tried: aggressive disconnect, dcc disconnect (disabled in lg c4 tv)

So I don't know what else to do!

Thanks

[waydabber]

No, Macs support HDMI-CEC with the built-in HDMI port only (it uses a different chipset than the VMM7100 Cablematters adapters).