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Found this on Reddit, hopefully it helps: https://www.reddit.com/r/kde/comments/1g0lpb9/comment/lrd4t1k/
Thanks, it worked! I enabled HDR before and never had any problems with it on NVIDIA with the latest 560 driver.
I knew it. Totally smelled like a new ENV variable. Thanks.
KWIN_DRM_ALLOW_NVIDIA_COLORSPACE=1
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