Huh, i wonder if that means that i can finally use VRR with my displayport to hdmi cable which connects a Rdna2 GPU with a LG CX tv.
TBH loosing VRR by switching to Linux was a way smaller QOL downgrade than i expected to be. It only really annoyed me on the first day apart from the very few games which suffer from really bad tearing without V-sync. I am still really annoyed that i had to buy an extra cable because of the HDMI Forum though. Like the drivers are written and done for years now but those assholes are just blocking it. Fuck them.
Some adapters already supported Freesync before these changes but of course the TV also requires Freesync support.
Yeah, i read about that. You need to flash some weird firmware onto those cables/adapters of Cable Matters. But it seems to only work on RDNA3 (maybe onwards). Atleast i never read from anybody getting VRR running on RDNA2 with a DP1.4 adapter/cable. It does work with my HDMI cable but the transmission obviously falls back to HDMI 2.0 speeds which only allows a horribly subsampled image. Atleast if we are talking about 4k120 VRR or even worse with 10Bit HDR on top.
I can confirm it works on both RDNA2 and RDNA4, with one of the cablematters adapters. I did flash the firmware but it also worked before flashing, was just buggier. Freesync and HDR work on both GPUs, also. The only remaining issue I have (before the patchset) is the display going into standby causing issues.
Sweet! Finally a confirmation that it works with RDNA2. Time to pull the trigger on yet another adapter. :D
I have three identical monitors and (under the time pressure of trying to research while standing in line on launch day), I accidentally bought the wrong version of my graphics card: one with 2x DisplayPort/2x HDMI instead of 3x DisplayPort/1x HDMI. I realized my mistake almost immediately, but because of shortages I of course couldn’t exchange the card for a different version, and I’ve been continually mildly annoyed ever since because the monitor hooked up via HDMI doesn’t behave well compared to the other two. It takes longer to wake up, the picture jiggles up and down occasionally when I play fullscreen video on it, and I’ve even noticed the picture getting tinted sometimes, as if one of the color channels were failing.
I hope this has a side effect of fixing some of that.
What features are still missing after this gets merged? Right now, I still use a glitchy adapter that randomly drops out every few minutes and sometimes crashes my whole Hyprland WM due to an unsteady state when no displays are recognised/connected.
I would love to use my GPU and display with the features I paid for.
One of the comments on the phoronix post mention display stream compression (DSC) and fixed rate link (FRL - specific to HDMI 2.1), both assist with high bandwidth throughput.
