UI scaling issues and planet texture flickering at super-ultrawide 32:9 resolution

[NEODIMIO]

Hello, I would like to report a visual and UI issue that occurs when running Kitten Space Agency on a 32:9 monitor using the resolution 7680x2160. I am launching the game through Steam as a non-Steam game using Proton 10.0-3.


First of all, I want to clarify that I have no mods enabled. This is happening on a completely clean, unmodded installation of the game.


I also want to clarify that this issue is very likely not related to Linux or Proton. Everything suggests that the problem comes from the extreme 32:9 aspect ratio and resolution, so it is very likely to happen on Windows or other operating systems as well.


What I expected to happen
The game should work normally at 32:9 resolution:

• Planet textures should render without flickering.
• UI elements should scale correctly, stay in the correct positions, and have an appropriate size.
• Buttons should be clickable and fully visible without needing to move them manually.

What actually happens
When running the game at 7680x2160 in fullscreen, borderless, or even windowed mode:

• Planet textures flicker constantly.
• The UI becomes oversized, misaligned, and incorrectly scaled.
• Many buttons do not respond when clicked, as if the clickable area is shifted.
• To view the full buttons inside menus, I must hold Shift and scroll to move the content inside the UI panel.
• If I switch the game to a 16:9 resolution, everything works perfectly.

Steps to reproduce

1. Add KSA to Steam as a non-Steam game.
2. Launch it using Proton 10.0-3.
3. Ensure that no mods are enabled (clean installation).
4. Set monitor resolution to 7680x2160 (32:9).
5. Run the game in fullscreen, borderless, or windowed mode.
6. Observe the UI scaling problems, the flickering textures, and the need to use Shift + scroll to see full buttons.
7. Switch to a 16:9 resolution and confirm the issue disappears.

Additional information
Operating system: Arch Linux
Desktop environment: KDE Plasma (Wayland)
Proton version: 10.0-3
Protontricks installed
Mods: None
CPU: AMD Ryzen 9 9950X
GPU: AMD Radeon RX 9070 XT (16 GB VRAM)
RAM: 64 GB DDR5 (quad channel)
Monitor: 32:9 (7680x2160) at 240 Hz
Storage: Samsung NVMe 980 Pro 2 TB
Power supply: 1000 W


I am attaching a video that clearly shows the issue:
"Screen recording"

 

[Lucky]

I can confirm this behavior running on Windows using the default executable and a 7680x2160 (32:9) resolution.

 

[NEODIMIO]

I can confirm this behavior running on Windows using the default executable and a 7680x2160 (32:9) resolution.

So apparently the issue is the aspect ratio/resolution, not the operating system, I think. But either way, a fix is still needed.