[NAME]  That is increasing my suspicion that this may be a driver issue.  YCbCr420 doesn't "hint" at HDR support though.  Yes 4K 60 Hz HDR uses YCbCr420 over HDMI 2.0, but that's because dropping chroma to 4:2:0 is the only way to run 4K 60 Hz HDR without exceeding the bandwidth capabilities of HDMI 2.0.  It's not "better" than YCbCr444 or RGB.  So in your case it may be running 4:2:0 for the same reason of thinking that there isn't enough bandwidth available.But speaking of HDR, if your TV actually has that, then one solution you may want to consider would be a USB-C to HDMI 2.0b adapter, like this one, or for even more futureproofing, a USB-C HDMI 2.1 adapter, like this one.  Those would both actually tap into your system's DP Alt Mode 1.4 support, whereas USB-C to HDMI 2.0 adapters might only support DP 1.2 source signals because that's all that's required for 4K 60 Hz SDR.
Hi, I recently got Inspiron 14 5410 with Intel 11th gen I5, Intel Iris Xe, and USB 3.2 Gen 2x2 Type C port with DisplayPort 1.4 and Power Delivery. It's running Windows 11. My plan is to use it with external Samsung TV 4K. The problem is that when I plug TV using USB-C to HDMI cable rated for 4K[NAME] I can see only video at 60Hz but no audio. TV would not be even detected as sound output device. If I lower refresh rate to 30Hz then video and audio works just fine. Extra info. I use another USB 3.2 Gen1 port for Ethernet dongle to have wired network connection. Disconnecting it doesn't seem to make any difference. I'm a bit puzzled here as according to the spec of USB 3.2 Gen 2x2 Type C port with DisplayPort 1.4 it should have enough bandwidth to support 4K[NAME] video and audio. All drivers are up to date. All tricks from articles related to no HDMI audio are explored. Any ideas?
Inspiron 14 5410 with Intel 11th gen I5 and USB 3.2 Gen 2x2 Type C port with 
DisplayPort 1.4 and Power Delivery