this post was submitted on 25 Nov 2025
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Unable to set 4k120Hz via Cable Matters DP->HDMI 2.1 converter (linux.community)
submitted 3 weeks 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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[–] mat@linux.community 1 points 2 weeks ago

Wow, I had no idea about the green button info, thanks! I am not too bothered about VRR (it seems totally broken on Wayland for my GPU at the moment anyways, and I have been fine without it so far), but I bought this TV for the 120Hz and good colors, which so far have been mutually exclusive :P