Kult: Heretic Kingdoms
Log has lines:
warn: ConvertFormat: Unknown format encountered: 2
99085.565:01f0:01f4:fixme:d3dx:d3dx_pixel_format_id_from_d3dformat No d3dx_pixel_format_id for D3DFORMAT 0x00000002.
99085.565:01f0:01f4:fixme:d3dx:get_format_info Unknown format 0x00000002.
So game might be trying to use unsupported format?
The problem is not limited to the main menu. UI elements throughout the game are visually broken, while their input areas still appear to function. I was able to navigate into the game by clicking UI elements blindly, and the same rendering problem affects the in-game interface as well.
GPU: NVIDIA GeForce RTX 3060 Ti
Driver: NVIDIA 595.91.07
OS: Nobara Linux 44 KDE
Kernel: 7.2.0-202.nobara.fc44.x86_64
CPU: Ryzen 5 5600
Proton: 11.0
Also tested: Proton Hotfix, Experimental, Proton-GE, Proton-CachyOS
Resolution: 1920×1080
I tested additional Proton versions and found a change in the UI rendering behavior:
Proton 3–4: game does not run
Proton 5–8: game runs, but UI is heavily corrupted with rainbow/glitchy artifacts
Proton 9+: game runs, but UI is corrupted with black/invisible elements
Proton versions
proton hotfixx1 2026-08
Compatibility Report
System Information
I confirm:
Symptoms
Main menu is not rendered correctly. There is likely some text for options but they are all black.
Reproduction
Note: to get the game to start the "kult.bat" needs to be modied and line "start /d "." kult.exe" should be just name of the executable (kult.exe) since the "start" command gives error currently.
steam-277650.log