Hello,
As you might know, AMD gpus don’t support HDMI 2.1, so some users are resorting to using DP to HDMI PCON adapters such as this one.
Unfortunately, on some displays, it still doesn’t fully work because of malformed display EDIDs.
I spent a long time debugging and trying different EDIDs (many many that should’ve worked) until I got one that gave me 4K 144Hz + HDR + VRR with my S90D TV. Without this, I am limited to 4k 120Hz + HDR (no VRR). I wanted to share it so that other people don’t spend as much time to get it working. It should even work with HDMI.
Link:
Even if you don’t have a S90D and are having issues with freesync or 4k 144Hz, feel free to try it out.
Guide to override your EDID in linux:
https://wiki.archlinux.org/title/Kernel_mode_setting#Forcing_modes_and_EDID
Thanks.
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THANK YOU!!! I was trying to get my steam deck to enable VRR in game mode with this TV as it supports Freesync Premium to no avail. It is definitely a problem with the S90D not including the proper Vendor-Specific Data Block (VSDB) advertising Free Sync and it’s refresh rate ranges within the EDID. Your modified file worked like a charm. Now I am able to do 4K 144Hz HDR VRR over HDMI 2.1 using the BenQ GR10 dock!
I got it functioning by forcing the steam deck to use this file via kernel boot command. SteamOS uses the GRUB bootloader, so just know if you want to follow the linux guide that OP provided above, it’s a little bit different. I used ChatGPT5 as a guide and it worked like a charm!
Hello, I’m coming into this to say that I supposedly have the exact same setup as Nebnampach (Steam Deck OLED + BenQ GR10 dock), and I can’t get it to work, even using ChatGPT as a guide. My TV can show an ROG Ally with these standards (4K 144Hz HDR VRR) just fine, which proves the cable/dock themselves aren’t the problem.
Are there other things we need to keep in mind? Does the size of the S90D matter (mine is 65" for example)? Are there different SKUs of the S90D?
I’m saying/checking all these, even though through my own troubleshooting, the BenQ GR10 dock’s communication with the Steam Deck’s kernel seems to be the biggest bottleneck for me.
A bit of an update: I did yet another ChatGPT thread from scratch, and now it’s implying that the Fixed Rate Link (FRL) is limited by the chip in the BenQ GR10? So…it can’t quite decide whether it’s an issue of writing to the kernel (something I was able to do successfully but it just…never writes) or if FRL is the problem.
I’m chalking this up to there not being 100% official HDMI 2.1 support on AMD & Linux, but I’m still struggling to figure out how a few people are getting this unicorn of 4K 144Hz + HDR + VRR to work with a Steam Deck + Dock.