https://bugs.kde.org/show_bug.cgi?id=452219
--- Comment #1 from André M <[email protected]> --- I can confirm this issue as well, with an MSI GS63VR 7RF (i7-7700HQ + Nvidia 1060), on NixOS unstable. Interesting enough, in my case, the internal screen stays smooth, and only the external monitor gets low performance and high CPU usage. I can confirm it quantitatively by running glxgears. If the window is on the internal screen, I get ~60FPS (vsync'd). If I move the glxgears window to the external, nvidia-connected screen, it drops to ~32-36 FPS, and even the cursor gets choppy. Also, sometimes when connecting external monitor after plasma startup, something gets weird, wallpaper doesn't show up, but I can move the mouse and windows to the external screen. My current workaround is a thunderbolt3 port with a thunderbolt->HDMI adapter, which is detected as eDP, runs on iGPU, and glxgears reports 75FPS (75hz monitor) and a smooth desktop. -- You are receiving this mail because: You are watching all bug changes.
