this post was submitted on 05 Jul 2025
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Hi there, I've got these really odd issue where certain windows will cause random lines like the one in the screenshot appear on my screen. They will often flicker a bit and will dissapear if I hover my mouse over them. The lines will display what is beneath the window itself. These occour quite frequently and are frankly getting quite annoying to deal with.

Is this a known issue with KDE right now? It does not happen while using Gnome on the same machine + screen. If it matters I am running CachyOS.

If there is anythign I can do to fix this then I'd greatly appriciate some pointers!

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[โ€“] Sunny@slrpnk.net 3 points 1 week ago

This screenshot is from 30 seconds after this was posted. For context, the app I've got open is Kate, and below it is Firefox. The line is much longer now, but same width. The lines also never change in width, only in length.

Need more info:

  • GPU
  • Compositor being used
  • Resolution and refresh settings
  • What cable is your monitor using
  • Does your monitor status info match your desktop settings (check monitor info menu for refresh rate and resolution)
  • Does it happen in all resolutions, or just specific ones?