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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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[–] afk_strats@lemmy.world 2 points 17 hours ago

I'm familiar with that thread. I have a C1 tv which I wanted to use with an Intel iGPU at 4K120 HDR. The Intel HDMI output can only do 4K60 outside of Wndows. The iGPU's dp does work at 4K120HDR. Out of curiosity, I also confirmed it works on a 7900xt at 4K120 HDR. I did this on Kubuntu and CachyOS with Plasma on Wayland

I used this cable: https://www.amazon.com/dp/B0D7VP726N

Not an ideal setup as HDMI 2.1 had slightly more bandwidth which translates to better picture quality, but it works better for me