Hmm....Linux already has FSR Implementation ...
https://youtu.be/ssPPTeXzyAs

Thanks Cool_Sky! Great to know! However this does not address games that run natively on Linux, only games launched with Proton. Being able to run this tool on Linux, even with Proton, would be super helpful.

This is something I'm interested in as well.

After testing the Proton way of doing this, it also seems it doesn't always work (like when the game you run is a launcher and not the actual game), and sometimes cause worse performance than if you just run it at the native resolution.

Having a third party application able to do this on Linux would be extremely useful.

I'm looking for a alternative in linux too.
Very sad don't be able to scaling that in native apps

@marcussacana at least games you play via steam play (proton) can scale via fsr now. Not a perfect fix, but most games I play that benefit from scaling are windows games anyway.

My earlier comment about worse performance seems to no longer be an issue I encounter with the later ProtonGE releases.

If you have an AMD graphics card, the latest driver can apparently also scale all games natively exactly like this software. Including use a frame rate target rather than resolution target in some games.

https://boilingsteam.com/using-fsr-to-boost-any-games-framerate-on-linux/

I think my intel uhd graphics 600 (intel celeron n4020) will not handle fsr

short answer, user gamescope
https://github.com/ValveSoftware/gamescope

now, as a long time linux user here is my take

long answer, lossless scaling would have to start over from scratch and create an entire code base to deal with a drastically different set of window management systems. In order to make it universal and not DE specific or an absolute chore to maintain lossless would have to be basically another compositor like gamescope in order to accomplish its goals. There is also a fair number of limitations to Wayland and X11 (X11 with mutli-monitor issues, wayland with difficulty with global hotkeys, etc) that make this sort of tool much more complicated to implement which is why gamescope exists at all.

Youre asking for a do over from square one, learn to write a custom compositor and deal with the issues that are involved with running a compositor within a compositor, and any multitude of issues i cant immediately think of. It would be an absolutely massive task for a very small fraction of potential buyers of this sort of tool.

While the linux game experience has improved and is a great state for most people lets not kid ourselves and think linux has reach any point yet that it really matters for most developers. In this case its not just a small ask, its a herculean task and its simply not worth the effort.

Curious on why a beyond extreme minority stick to an os where nothing work on it.

Originally posted by - EMPTY -:

Curious on why a beyond extreme minority stick to an os where nothing work on it.

Depending on your level of patience/amount of free time and what exactly you want to do, reports of nothing working on Linux are greatly exaggerated, from what I'm told.

Also, for some, spite towards Microsoft (and probably Apple too) can be a powerful motivator.

Originally posted by - EMPTY -:

Curious on why a beyond extreme minority stick to an os where nothing work on it.

Every game in my library works on Linux, some run better like Elden Ring.

The issue isn't generally nothing working, its niche things not working. If its very widely used and supported it generally works on Linux without fuss unless its specifically tied to Microsoft technologies that WINE can't yet handle.

I'm on Windows ATM as my primary for work and related reasons but I will say setting up my system on Linux is drastically easier on Linux and it overall just stays outta my way vs Windows constantly trying to obfuscate even the simplest of settings.

I.E disabling PSR on Windows in example requires digging through the registry and hoping it worked (you get zero feedback if it did) while on Linux its 1 command to your boot options and it tells you its good.

Speaking of Linux BTW, WINE 10 just added mode set emulation which is pretending to change resolution without actually changing screen res. This allows arbitrary application resolutions with black bars padding automatically which my AMD GPU can't even do on Windows.