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Unable to wake Fedora KDE Plasma Desktop 43 from monitor sleep
(piefed.social)
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I have had issues like this with “deep sleep” on some monitors. Sometimes manufacturers release monitor firmware updates to fix, sometimes they don’t…good luck!
Edit: iirc it is a DisplayPort related issue and shouldn’t happen if you’re using hdmi instead, could be one option for you to pursue.
I'll look into the HDMI route, but as far as I'm aware it won't support the ultrawide at 240Hz so I either give up what I paid for hardware capability or switch back to windows, unfortunately.