I currently have a PC running Windows 11 that my S/O and I use multi-seated with Aster Multiseat. However, we're both equally sick of Windows and are interested in switching to Linux.
However, all the information that I can find on multiseat in Linux are forum posts and unfinished wiki entries for Ubuntu and Fedora, and they all seem to be from around 2008-2012.
We're about to upgrade our PC to support two RTX 3060s and a Ryzen 9 (of course, including the usual two monitors and sets of peripherals).
Can Linux (preferably Fedora, as it's my favorite distro so far) easily support multiseating?
Will there be any performance issues using this method?
Is it possible to isolate applications per user? (Aster Multiseat doesn't do this, so sometimes an application can detect another instance on the other user and refuses to start...)
You can run multiple X servers for a graphical multiseat setup. It's a lot of work to set it up and most of the information about it is out of date though.
I don't know why you're being downvoted because basically we don't know. It mentions that it's supported but there's no info about how to do it and no compositors or WMs that implement it, so... yes, technically there's no support for multiseating at the moment. If anybody can point at one that can do it in the way OP needs it I'll be glad to stand corrected.
There is some setup to be done, but "a lot of"? ... If I remember correctly you just need to define the multiple outputs and bind the inputs to their individual instances.