Is the a USB-C/Thunderbolt to HDMI 2.1 dongle? Send Displayport and audio over USB-C and then let that hardware handle the HDMI handshaking.

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klipklop 3 days ago | parent [-]

There isn't one that supports VRR/Gsync/Freesync well. What gamers want is chroma/RGB 4:4:4 + HDR + VRR/Freesync + 4k,120hz for their Linux PC on a TV. This is not possible with any DP --> HDMI 2.1 dongle on the market. They need support at the driver level to make this work. This is what the idiots at the HDMI forum are blocking. The only way to have high quality visuals on a PC/TV setup is to run Windows. That really sucks.

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sunshowers 3 days ago | parent | next [-]

I do actually have this setup going with a Cable Matters adapter [1] + a custom firmware I found [2] and

> chroma/RGB 4:4:4 + HDR + VRR/Freesync + 4k,120hz for their Linux PC on a TV

works great now on my LG C4 TV with Bazzite's gaming mode, though:

* 144Hz is unstable

* 12-bit color is unstable (10-bit works fine), and gamescope doesn't have a way to limit color depth (kwin does), so I had to put in place an EDID override

* in the EDID, limiting the FreeSync range to 60-120Hz (which should still allow frame doubling/tripling) seemed to be better -- the default 40Hz caused a bit of flickering because the AMD driver would drop the refresh rate down to 38.5Hz or so.

Should write about this in more detail.

[1] https://www.amazon.com/dp/B094XR43M5

[2] https://forum.level1techs.com/t/it-is-possible-to-4k-120-hdr...

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klipklop 3 days ago | parent | prev | next [-]

I can't edit now, but it seems that there is a new dongle on the market that might be able to do this with some changes (whitelists?) to the AMDGPU driver in Linux.

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Fire-Dragon-DoL 3 days ago | parent | prev [-]

This is terrible.

Aren't there on the market big "pc monitors" instead of tvs?

	▲	raggi 3 days ago \| parent [-]
		Not with good measured performance no. There are some which advertise good numbers (such as high refresh rates) but are unable to drive the panels to visibly change pixels at anywhere near the refresh rate.