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After upgrading to Plasma 6, presentation mode doesn't seem to work; the screen dims after a period of inactivity regardless. This happens both when presentation mode is activated by an application (say, a full-screen video playing) and when it's activated manually in the Screen Layout plasmoid. As far as I can tell, none of the relevant display or power settings have changed.
This is in an X11 session; I switched back to X11 from Wayland after encountering numerous bugs detailed in this thread.
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