Arch Linux

agurkmeister

Member

Registered: 2024-01-16

Posts: 8

[SOLVED] Multiple monitor setup on Xorg issues.

This is probably a very simple solution but I've struggled to find solutions online so I'm coming here to ask now for a definitive answer.

How do you choose which monitor to sync to in Xorg? I have my main 144hz monitor and a secondary 75hz monitor and whenever I e.g. move a window around on the desktop the window lags at (I assume) 75fps even though I'm dragging it around on my main monitor.
I believe I was told you can just choose which monitor Xorg should sync to but I haven't been able to find out how to pick that on the internet so far.

Note:
I'm using an AMD gpu. (RX 7800 XT)
I'm running Cinnamon Desktop.

Last edited by agurkmeister (2024-04-22 21:01:29)

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 76,005

Re: [SOLVED] Multiple monitor setup on Xorg issues.

https://wiki.archlinux.org/title/Variab … figuration

the desktop the window lags at (I assume) 75fps

Unlikely, there's gonna be a double sync, probably between the server (some "tearfree" setting) and the compositor and you're seeing 30 or 37.5 fps - 60fps+ do not cause a notable "lag" when dragging windows.

I believe I was told you can just choose which monitor Xorg should sync to

Nvidia has a setting/environment variable for that, for amdgpu I guess your best bet is the xrandr --primary setting

https://wiki.archlinux.org/title/Intel_ … on_(VSYNC)
In case the 144HZ are actually VRR, nb. that muffin and cinnamon are both blacklisted in /usr/share/drirc.d/00-mesa-defaults.conf

Also nb. that xf86-video-amdgpu ./. modesetting might cause different behavior itr

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