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The HDMI Forum rejected AMD's open source HDMI 2.1 implementation
(www.gamingonlinux.com)
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this post was submitted on 29 Feb 2024
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This is really frustrating. This is the only thing holding Linux gaming back for me, as someone who games with a AMD GPU and an OLED TV. On Windows 4k120 works fine, but on Linux I can only get 4k60. I've been trying to use an adapter, but it crashes a lot.
AMD seemed to be really trying to bring this feature to Linux, too. Really tragic that they were trying to support us, and some anti-open source goons shot them down.
ive found that the issue in my experience is that X11 only supports a max of 4k60, but Wayland supports 4k120 and beyond. I dont think the cable matters as the same cable im using works on windows with 4k160.
It's a matter of cable bandwidth. 4k120 4:4:4 requires more bandwidth than hdmi 2.0 can provide. You can drop down to 4:2:0, but that's a pretty bad experience and ruins the image quality.
I've been using an adapter cable, but it's really flaky, I don't know if it's a bad cable or what. But a normal hdmi cable just plain works on Windows, since the windows amd driver supports hdmi 2.1.
yes, that is a valid factor. i meant more towards the type of cable doesn't mater. but yes an up to date spec of the cable is also just as important
are you unable to use display port?
The OLED TV probably only has HDMI. TVs don’t normally have DisplayPort
There are DisplayPort to HDMI adapters. Like this one:
https://www.amazon.com/dp/B08XFSLWQF
None of the adapters seem to support VRR though, for whatever reason.
Same reason probably: the HDMI forum
Freesync works for me with that cable, but I have some awful cable training problem or something. Everytime the screen is reset, it refuses to go above 4k60 or turn on freesync, and it'll only work again after I have the screen connected for a few minutes. So whenever I start my comouter, have to switch down 4k60 and wait like half an hour to be able to use high refresh rate. It's been doing this for months.
I don't know if I have a bad cable, weird interference, or if FRL adapters are just flaky.
I'm a bit confused by your comment. I have a 120Hz Monitor and use an AMD GPU on linux without issues. Connected via the display port on my GPU to the HDMI Port on my monitor (because samsung does not enable DDC on the display port for some reason).
I'm using an LG C2 Oled TV that doesnt have displayport.
ichbinjasokreativ seems to suggest that the viewing device he/she connects to is done via HDMI, the same as your OLED TV.
Unless I'm missing something?
Edit: You discuss this issue further down in the topic, so no need to reply.
Could have saved myself the time of replying to you if I had scrolled all the way through first, then backtracked, but that's kind of unintuitive to do, especially on a cell phone browser.
No worries, I didn't see they meant an adapter cable, either.
I have one too. Go take a look at Cable Matters. I am able to play games at 4k120 with my mac. See if something will work for you and you can always send a message to their customer support to ask questions.
Yeah thats the one I have. Maybe I'll ask their support. It has the latest firmware but it's so flaky about being able to do high bandwidth.