[Wayland] Games using DXVK/VKD3D stuck at 60 FPS on Fedora 42 + KDE Plasma 6.4

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1

I’ve been running Fedora 42 with KDE Plasma 6.4 (Wayland) for around half a year and since mid september I’ve run into a really annoying issue: any DirectX game that goes through DXVK or VKD3D-Proton seems to be hard-capped at 60 FPS, no matter what I do.

Native Vulkan games like Albion Online or No Man’s Sky run perfectly fine full FPS, smooth as butter.
But anything that uses DXVK/VKD3D (for example CS2 or Payday 3) gets stuck right around 60 FPS even with V-Sync disabled in-game and in KWin. If I switch to X11 (I installed Plasma X11 manually), the cap disappears instantly and the game runs at 150-200 FPS like it should. its not always 60 fps, its uncapped when im in menus n stuff but when im ingame and my gpu is being used it just sits around 50-70.

Here’s what I’ve already tried without success:

Completely disabling V-Sync in Plasma/KWin.

  • Editing kwinrc manually and adjusting tearing prevention settings.

  • Testing with and without VRR (Variable Refresh Rate).

  • Setting environment variables like vblank_mode=0 and __GL_MaxFramesAllowed.

  • Reverting to an older kernel (Fedora 6.16.4) to rule out regressions.

System details:
Fedora 42 (kernel 6.16.8-200.fc42.x86_64)
Mesa 25.1.9
OpenGL core profile: 4.6 (Core Profile)
OpenGL compatibility profile: 4.6
OpenGL ES profile: 3.2
KDE Plasma 6.4.5 (Wayland)
KWin 6.4.5
GPU: AMD Radeon RX 6950 XT (Navi 21)
CPU: AMD Ryzen 9 5900X

2

Updating to kernel 6.16.10-200.fc42 completely resolved the issue.
It must have been a problem with one of the earlier versions 6.16.4, 6.16.6, or 6.16.8 since the FPS cap started appearing around mid-September.

4

never mind, after trying to play again today without changing anything it seems to be broken and locked to 60 fps again sadge ;(

5

Update:

If I restart my PC (same kernels as listed above) and launch Payday 3 right away, I get full FPS as expected.
However, if I open any other program before starting the game like Kitty, Discord, Spotify, or Firefox my FPS drops back to around 60 once I’m in a heist.

Interestingly, if I start Payday 3 first and then open those other apps afterward, everything stays smooth and uncapped.
But as soon as I close and relaunch the game while those programs are already running, the 60 FPS cap returns.

Does anyone have any idea what could be causing this behavior?

6

Disabled hardware acceleration on firefox, discord and in the flatpak of spotify and it seems to be better