On my laptop, screen usually goes into power saving mode, after a few tens of seconds. (this laptop never goes to sleep, generally speaking, but I like the screen to turn itself off nevertheless)
In contrast, when I have an opened Chromium window, screen often never goes into power saving mode. I haven't found any comments, nowhere, regarding that, on the net. I might want to file a bug about that, but since it might be "desktop dependent", I prefer to ask you if you have observed this situation. I can't see anything, but Chromium, at the origin of the screen remaining turned on forever; occurrences point very consistently in that direction. Pages that were opened this time, were: Two google search pages; Five pages there: https://orgmode.org/worg/ and there: https://orgmode.org/manual/ And that: https://www.cs.tufts.edu/~nr/noweb/ So, as it is this time, nothing with aggressive advertising, or auto-playing videos, or whatever in that line. That issue, which I might be alone experiencing, is quite cumbersome, since it forces me to close Chromium, even though I haven't finished reading what it is I'm reading; that if I want my screen not to be prevented to go in power saving mode. Thanks, Chris