1mo ago

KDE doubling framerate Issue

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I'm having issues with KDE seemingly doubling my monitors refresh rate in small bursts, which is causing stuttering and smoothness issues.

A bit of background on the setup:

I have a 1080p monitor at 144hz a 1440p monitor also a 144hz external capture card that is a duplicate of of the 1440p monitor also able to accept 144hz.

What I'm seeing is the main monitor (1440p) frame rate with jump between 144 and 288fps refresh rate and i'm not sure how to stop the behavior or even really how best to start troubleshooting it.

Any advice would be awesome

Images / Video of issue here: https://imgur.com/a/T6HzVD6

5 comments

Can you clarify what graphics driver do you have in use currently? Dunno if it’s kwin_wayland problem or a driver problem, but wonder if it isn’t on NVIDIA
- Hey thanks so much for replying, currently using amdgpu. GPU is an AMD 7900xtx. Heres the output of lspci -v for the GPU.
  Any idea how i can narrow it down to know if it is a kwin_wayland issue or driver?
  
  0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Navi 31 [Radeon RX 7900 XT/7900 XTX/7900 GRE/7900M] (rev c8) (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. TUF Gaming Radeon RX 7900 XTX OC Flags: bus master, fast devsel, latency 0, IRQ 112, IOMMU group 29 Memory at f000000000 (64-bit, prefetchable) [size=32G] Memory at f800000000 (64-bit, prefetchable) [size=256M] I/O ports at f000 [size=256] Memory at fcc00000 (32-bit, non-prefetchable) [size=1M] Expansion ROM at fcd00000 [disabled] [size=128K] Capabilities: <access denied> Kernel driver in use: amdgpu Kernel modules: amdgpu
  
  The problem isn’t reproducible without the display cloning to your Elgato capture card, right? Could you try a different compositor like Sway, Wayfire, Hyprland or cosmic-comp? If it works well there, you could report issue on https://bugs.kde.org/ in kwin project.

updated link so it actually works

Screen mirroring is kinda shitty rn, this might get fixed with future changes for Plasma 6.4 (which make it less shitty in general). It's probably worth fixing this as a separate thing for 6.3 though, so please make a bug report about this for KWin at bugs.kde.org