The downside is your refresh rate is locked to the slowest monitor.

This report doesn't agree with what I tested just now.

Using the xrandr CLI to set the refresh rate to 24.0 on my primary monitor and 60.0 on my secondary results in "cinematic" visuals on the primary monitor and normal "soap opera" visuals on the secondary. Setting the refresh rate back to 60 on my primary results in "soap opera" visuals on both.

I'm currently using Windowmaker, but I see no reason why this wouldn't work with KDE. I'm using xorg-server 21.1.23 (which supports RandR 1.6), xf86-video-amdgpu 25.0.0, xrandr CLI version 1.5.4, and kernel 7.0.12.

I'm on Gentoo Linux. I would not be surprised to learn that Debian (and Debian-derived distros) never shipped a version of Xorg or the related libraries where this worked correctly.

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winrid 5 hours ago | parent [-]

It's possible it has been fixed in the last couple years but for a while it was the case.

	▲	simoncion 5 hours ago \| parent [-]
		Were you -perhaps- using GNOME and the GNOME-provided GUIs to change monitor refresh rate? Given GNOME's history of legendarily user-hostile decisions made in the name of "simplicity", it would surprise me not even a little bit that the GNOME folks decided to pretend that the active monitor with the lowest refresh rate dictated the fastest you could drive any monitor.