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This seems to be a recognised issue with KDE and Nvidia, but the suggested fix hasn't worked for me.

The suggested fix is to add one of these lines to the /etc/profile.d/kwin.sh file and reboot (only try the second if the first doesn't work, and don't use both at once):

export __GL_YIELD="USLEEP"

export KWIN_TRIPLE_BUFFER=1

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I was able to fix my screen tearing on Kubuntu with export __GL_YIELD="USLEEP" as /etc/profile.d/kwin.sh like you have and GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nvidia-drm.modeset=1" with kernel parameters (and update grub!).

Have you tried this yet?

  • Thanks, I hadn't tried adding that to the grub, it has actually stopped the tearing! But there is still stuttering and lagging, such as in a fast moving part of a video or when resizing a window. Do you this problem as well? – dhhhj Nov 22 '18 at 16:22
  • Compared to Windows 10, yes. From my experience, many desktop environments just aren't as smooth as you expect it to be. This could be just my card though (gtx 1080). – David Nov 22 '18 at 21:35
  • Thanks again for your answer, such a relief not to have the screen tearing, was driving me mad! Yes I think the screen stuttering etc. might just be because I am looking too closely at the screen, it does seem that Windows 10 is smoother though, which is annoying as I thought KDE was supposed to be one of the best desktop environments for linux – dhhhj Nov 23 '18 at 10:47

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