Bazzite-42 Multi-Monitor Scaling

[OriginalAlienOne]

I am experiencing this same issue. Changing the scaling actually causes apps and games to open on different monitors, lock out resolutions, and pushes primary desktop display slightly onto other monitors.

Output of rpm-ostree status:

State: idle
Deployments:
● ostree-image-signed:docker://ghcr.io/ublue-os/bazzite-nvidia-open:stable
Digest: sha256:005d7a0eccac4bee7bff1651c5bf11267eb14d4de349144f83f1bad6482ddc93
Version: 41.20250409.1 (2025-04-09T19:11:15Z)
LayeredPackages: coolercontrol liquidctl

ostree-image-signed:docker://ghcr.io/ublue-os/bazzite-nvidia-open:stable
Digest: sha256:005d7a0eccac4bee7bff1651c5bf11267eb14d4de349144f83f1bad6482ddc93
Version: 41.20250409.1 (2025-04-09T19:11:15Z)

For reference, I've included a "print screen" screenshot of what it does to my desktop if monitors 1&2 are at 100% scaling and monitor 3 is at 95%. The desktop is pushing slightly to the left into the left monitor (lower image). Current setup has all three monitors at 100% scaling, and Cyberpunk's highest resolution on my primary monitor will only go up to 2215x1246, and the monitor is a 3440x1440 display (upper image).

Originally posted by @OriginalAlienOne in #1831

[OriginalAlienOne]

Hello, this is my new deployment:

State: idle
Deployments:
● ostree-image-signed:docker://ghcr.io/ublue-os/bazzite-nvidia-open:stable
Digest: sha256:4f0154f7a83a26e3b22bbc3b709eb73131b46ea1c082a6ce0791b1d606eae018
Version: 42.20250430 (2025-05-01T19:27:16Z)
LayeredPackages: coolercontrol liquidctl

ostree-image-signed:docker://ghcr.io/ublue-os/bazzite-nvidia-open:stable
Digest: sha256:005d7a0eccac4bee7bff1651c5bf11267eb14d4de349144f83f1bad6482ddc93
Version: 41.20250409.1 (2025-04-09T19:11:15Z)
LayeredPackages: coolercontrol liquidctl

I am not sure why it's showing two different versions, but I upgraded to 42 as requested, and I'm experiencing the same issue as before (mentioned above). Upgrading also introduced a new issue of drives not mounting that mounted before in the previous version. That's a separate issue, so I'll keep it focused on this multi-monitor scaling issue.

Additionally, I'm not sure if it's possible to clean up the multiple entries in Grub (there are four listed for me above my Windows entry), but that'd be awesome. If someone could point me in the right direction for that as well, that'd be great. I'm trying to make a full transition to Linux this year as Windows 10 goes end-of-life, so I'm trying to figure out how I can have the same sort of setup I had on Windows. I understand some things will be different, but with the explosion of gaming on Linux (hence choosing Bazzite), that's what pushed me to make the plunge. This issue of games not displaying correctly or even showing the correct resolution when starting up is pretty game-breaking.

[OriginalAlienOne]

So, to update the situation, that issue of the primary monitor pushing into the left monitor (as seen in the screenshots above) was simply a matter of me not noticing in display settings that the displays were too close together. That was fixed.

However, making that one small change did not fix the primary issue listed, which is that scaling doesn't work correctly, and it causes games to not list the proper resolutions within the game. I have tried utilizing gamescope commands within Steam to fix the sizing issue, and that introduces new issues (such as the game not actually being full screen and the mouse pointer not being locked within the game window--which makes an FPS impossible to play). So, it would be nice if the scaling issue itself could be fixed.

One primary thing I'm seeing is that when I select "full screen" for anything (games or otherwise), any window I'm dealing with maximizes to a 16:9 frame, and doesn't actually maximize to the 21:9 my primary monitor is at. So, it's possible the issue is related directly to ultrawide monitors in particular.

[OriginalAlienOne]

I noticed in my latest screenshot that there appears to be some kind of "desktop" screen behind the main desktop that the game itself seems to be centering itself on. So, as I'm seeing it on my monitor, the game is off-screen on the bottom there, and that is the highest "1440p" resolution offered within the game. It also does not go full-screen when full-screen is selected.

It should also be noted that all monitors are at 125% scale in display settings, and when I change all monitors to 100% scale, no 1440p resolutions appear within the game settings, and instead the highest resolution available in the game is what is shown in the second screenshot.

[OriginalAlienOne]

Upon even further research, I believe the issue I'm having is related to what this person said here, which is referring to a "regression" of a Hyperland issue #2916 located here

Is this issue being looked at in the current version of Bazzite?

[OriginalAlienOne]

I believe I have found the source of the issue. My NVIDIA card has 4 displays connected to it. Three are connected to display ports and are arranged in the orientation you see in the screenshots above. The one on the left is a 4k monitor arranged vertically, the one in the middle is a 3440x1440 ultrawide (primary display), and the one on the right is another 4k monitor (same model as the first) arranged vertically (flipped). The fourth monitor is connected to a 4k television from the HDMI port.

In display settings, I have the primary display (21:9) duplicated onto the television display. This is what causes the apps/games to display incorrectly according to a 16:9 display "behind" the 21:9 display (as shown in the screenshot of the top picture of my last post).

I have found that when I disable the HDMI/TV display in display settings, games will properly display on the ultrawide display.

However, another oddity happens: The resolution given in games (I have tried about three games so far) to get them to display properly on the ultrawide display is higher than 3440x1440p if my display scaling is less than 100%.

I believe that if an expert in this area can figure out how to get the system to properly choose the ultrawide display as the prime display to draw first, then duplicating that image to a 4K monitor or television wouldn't cause these overlay/offset issues.

I hope that information helps get to the bottom of the issue.

[CodingKoalaGeneral]

I have the same issue. Also using a 4K TV (16:9) connected via HDMI and using a laptop with lid closed (build in monitor disabled) this causes Steam and all related applications to translate the click position wrongly which makes every game unplayable.

I looked up the issue and switched from scaling 250% to 200% and it worked as expected again.

fractional values (125%, 150%, 175%, 225%) all reproduce the wrong resolution and offset, while 100% and 200% work correctly.