this post was submitted on 08 Feb 2025
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Wayland, Freesync & 2 monitors - one not FS- compatible? (lemmy.fwgx.uk)
submitted 1 week ago by [email protected] to c/linux_gaming
10 comments fedilink hide all child comments
 

I currently have a dual monitor setup of a Dell 24" and 27", neither are variable refresh rate. I think the 24" monitor is getting on for 17 years old and has had issues with lines on it when cold for the past 13 years. But it's my second monitor and once it's warmed up it's not too bad. Well I think the time has come to retire it and for my main 27" to become my secondary monitor and buy a new primary. I am interested in photography so accurate colours are important to me, which is why I bought these monitors in the first place. But I also play games, so something with some gaming features like Freesync and >60Hz refresh rates I also want. I've got my eye on a ASUS ROG Strix XG27ACS, fwiw.

I am running Endeavour OS (kernel 6.13.1) with KDE Plasma (6.2.5) on Wayland with a Radeon RX 5700 XT. My question is: Will my setup allow me to run one non-freesync monitor @60Hz and one Freesync monitor using the VRR at up to 180Hz. So I can get all the benefits of the new monitor when gaming, without having to turn the second monitor off?

I believe that if I just had the one monitor I'd have no issues and my setup would be plug and play. But as this has been a long time coming with many issues along the way to get VRR on linux working, I'm concerned that it's a "everything must support it or it won't work" scenario.

Grateful for your insights and advise.

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[–] [email protected] 16 points 1 week ago (1 children)

It works perfectly, I have a 60Hz, 144Hz VRR HDR, and 60Hz.

This is one of the use cases where Wayland shines compared to Xorg.

[–] [email protected] 1 points 1 week ago (1 children)

Thanks. That fills me with a lot more confidence. Trigger pulled on the monitor.

[–] [email protected] 1 points 1 week ago* (last edited 1 week ago)

It works so well, if you stretch a window across more than one monitors of different refresh rates, it'll be able to vsync to all of them at once. I'm not sure if it'll VRR across multiple monitors at once, but it's definitely possible. Fullscreen on a single monitor definitely VRRs properly.

With my 60+144+60 setup and glxgears stretched across all of them, the framerate locks to something between like 215-235 as the monitors go in and out of sync with eachother, and none of them have any skips or tears. Some games get a little bit confused if the timing logic is tied to frame rate, but triple monitor Minecraft works great apart from the lack of FOV correction for the side monitors.

This is compositor dependent but I think most of the big compositors these days have it figured out. I'm on the latest KDE release with KWin.