Seems there's a bug in recent driver versions where displays over USB-C are not recognized properly.
EDIT: Driver version 126.96.36.19978 indeed fixes the washed out colors. It didn't add the missing options under General Settings, but it's a step up.
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Yeah, same here! My USB C monitor now matches the colors on the HDMI monitor with the 4678 driver!
As you also mentioned, the option to enable full quantization range is missing on the USB-C connected monitor, but it seems it is applying it.
Sidenote: How do you prevent window from auto-updating the driver?
I have the same problem when using usb-c to hdmi cable. Rolling back to 4678 driver fixed the problem, but obviously i would want use latest drivers. On latest drivers changing ycbcr off-on-off fixes the problem temporarily for couple of seconds but it reverts back to poor after that, (washed out, banding on color band test.)
Same problem when external Dell monitor is connected to my laptop via USB C to HDMI adapter.
When I'm plugged the built-in HDMI port everything is fine as well.
The workaround on Intel Graphics Settings > Display > General Settings works.
When I rolled back to my previous driver version, the problem existed and persisted (no fix) when I tried the workaround
Just to note that I have a xiaomi laptop and when I try to install general drivers from intel for integrated 620 graphics card, I
get an error that drivers are controlled by manufacturer (or something similar)
Any news about this issue?