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Unable to set 4k120Hz via Cable Matters DP->HDMI 2.1 converter (linux.community)

submitted 22 hours ago by mat@linux.community to c/linux@programming.dev

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I recently purchased a LG OLED C2 TV, which supports 4k120Hz but only has HDMI 2.1 ports. I am aware of HDMI 2.1 being an issue on AMD, even though my GPU is Nvidia (RTX 3060Ti) I want to switch to AMD in the future, so I opted to invest in an AMD-friendly setup. I purchased the Cable Matters active DisplayPort -> HDMI 2.1 converter mentioned in this Reddit thread, which purportedly can do 4k120. However, when I change it from the default 4k60 modeline to 4k120, the TV shows a "no signal" message. In fact, to get 120Hz I need to drop the resolution down to 1440p.

Even though I'm not going for VRR (yet), I also tried flashing the VRR-enabled "Spyder" firmware just in case it fixes the refresh rate (it does not). I tested every DP port on the 3060Ti as well, with no changes. What might I be doing wrong?

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[–] Hond@piefed.social 2 points 16 hours ago* (last edited 16 hours ago)

I have a LG CX and a AMD 6900XT. I just settled on some random noname adapter cable since i never could find reliable enough information on the net regarding VRR(irc you need atleast a rx7000 series amd card for that). Everything works on my setup except VRR. Atleast on the CX remote you can press the green button seven times to get an overlay that shows if 10bit, vrr, hdr, chroma subsampling, etc is in place. Helped me a lot when i tried to dial in everything.
Like 4k120 HDR VRR is perfectly possible with hdmi 2.0 bandwith. It will just be subsampled down to horrible 4:2:0...