Custom Resolution Utility (CRU)

[skola28]

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CRU is not for fixing problems like this. The TV already defines 3840x2160 @ 120 Hz, so there's no point in using CRU to add a resolution that already exists. The problem is you need HDMI 2.1 to get 3840x2160 @ 120 Hz. Both your computer and the dock only support HDMI 2.0.
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Thanks Toasty. I think I probably confused it with several other posts claiming 3840x2160@120 using 4:2:2. 8b over HDMI 2.0.
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I am in the process of attempting to connect DP1.4 from my dock to the C2 (DP to HDMI), once the cable arrives (HURRY UP AMAZON!).

I am also going to attempt USB-C to HDMI from either the USB-C on the laptop or the one on the WD19 dock.

The trick will be whether or not my Intel Iris Xe really outputs full DP1.4 on the USB-C ports.

This is one of the posts that originally got me thinking I could get 4K120 over HDMI 2.0. I think I was convinced that with CRU, I could make ONLY 420 8-bit color and 4k120 show up and sidestep my Intel Graphics Command Center which refuses to let me set custom resolutions.