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The screen in question is HDMI. The power off/on action is initiated by clicking on the on-screen capacitive button.

I just need to know if there is a way to get events like "now the screen is on", "now the screen is off/unplugged", "now the screen is in standby mode".

If at all possible, I would like to avoid timer-based approaches and to rely to events (however, a timer-based approach is still better than having no clue).

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Try xset q to get DPMS settings. Seems to say things like 'Monitor is On'

References:

  • That's unfortunately not working: I'm using Kodi through a framebuffer (RPi 2). I get xset: unable to open display "". Sorry for not specifying that before. – JohnW Dec 2 '15 at 20:12
  • By the way, specifying DISPLAY=0 or the like explicitly does not work either as Xorg is not even installed on the box. That said, Xorg gets its info from somewhere. If I knew what this "somewhere" was, that would work. – JohnW Dec 2 '15 at 20:17
  • Ah. ARM.I'd take a look at tvservice, vbetool and setterm as well. Or strace that xset and see what syscalls it does. Or look at the source. See: wiki.archlinux.org/index.php/… – Criveti Mihai Dec 2 '15 at 20:22
  • tvservice: that's how I can currently get the "screen turned on" event. vbetool: great hope, great disappointment (can just set DPMS, not read). setterm: same thing as vbetool but already disillusioned. :) – JohnW Dec 2 '15 at 20:58
  • BTW, I've already read all that has been cited (and much more). But except xset -q which works only with X, there is absolutely nothing about getting this kind of events. Only answers to the same tired (and unrelated) question: "doh, how can I turn off my screen from SW?". But this is not what I want. – JohnW Dec 2 '15 at 21:01

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