this post was submitted on 07 Jun 2024
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Wayland windows can apparently vsync to multiple monitors at once at different refresh rates (lemmy.max-p.me)
submitted 5 months ago* (last edited 5 months ago) by Max_P@lemmy.max-p.me to c/linux@lemmy.ml
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Neat little thing I just noticed, might be known but I never head of it before: apparently, a Wayland window can vsync to at least 3 monitors with different refresh rates at the same time.

I have 3 monitors, at 60 Hz, 144 Hz, and 60 Hz from left to right. I was using glxgears to test something, and noticed when I put the window between the monitors, it'll sync to a weird refresh rate of about 193 fps. I stretched it to span all 3 monitors, and it locked at about 243 fps. It seems to oscillate between 242.5 and 243.5 gradually back and forth. So apparently, it's mixing the vsync signals together and ensuring every monitor's got a fresh frame while sharing frames when the vsyncs line up.

I knew Wayland was big on "every frame is perfect", but I didn't expect that to work even across 3 monitors at once! We've come a long, long way in the graphics stack. I expected it to sync to the 144Hz monitor and just tear or hiccup on the other ones.

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[–] lung@lemmy.world 27 points 5 months ago (3 children)

Super apparent performance on my ancient Chromebook with barely any resources. Beautiful animations that make it look like a modern laptop, well, until ram runs out. It can run about 3x as much stuff compared to stock ChromeOS. Love this with Pipewire, Linux a/v is honestly better than both osx and windows now and I'm so impressed. Can even do pro audio type stuff where you route the a/v from one app to another. It's worth losing all the network ability that X11 has

[–] Max_P@lemmy.max-p.me 13 points 5 months ago (2 children)

Yeah, also pretty excited about PipeWire, the video stuff opens a ton of doors for OBS and broadcasting in general on Linux.

It's worth losing all the network ability that X11 has

Waypipe is pretty good, can totally watch YouTube over SSH into a VM. It uses video codecs for compression, so in theory it can probably even get extended into game streaming. Probably not so great on low bandwidth environments but it's not like modern apps use Xlib anyway, it's all rendered by the client.

DEs are also implementing compositor level RDP support, which brings in a ton of room for properly optimizing remote access.

[–] lung@lemmy.world 5 points 5 months ago (1 children)

Yeah I mean it's still kinda cool. X protocol is vector based iirc, and you can just set up xauth and use ssh -X to forward windows over ssh

Anyway I'm sure this doesn't matter today, and the performance sucks for typical use

[–] wewbull@feddit.uk 3 points 5 months ago

It does matter in distributed application on LANs. The thin client model is still in operation at a lot of HPC and similar environments. Laptops and Desktops just display what is being done elsewhere.

Remote X11 is a better user experience in that environment than anything else I've tried. It feels like the application is local even if it's not.