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 2 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 2 points 1 week ago

My understanding is that it doesn't have VRR for people (at least without the special firmware, which indeed only works for some). Not seen anything about it not supporting 4k@120Hz, though maybe I missed it as I read so many different threads about this topic...