[HN Gopher] Ask HN: Is there a reliable way in Linux to know if ...
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       Ask HN: Is there a reliable way in Linux to know if a monitor is
       on/off?
        
       I am developing a kiosk-ish application with raspberry to be
       managed remotely. So far I have managed to get to know if a monitor
       is connected to the HDMI, but in no way I can now if it has been
       switched off or has lost power. Also I have no way to know if
       someone has just pressed the off button. It is just that xset and
       xrandr (the option talked in numerous SO posts) doesn't get that
       information.  Is there any way?
        
       Author : juanse
       Score  : 10 points
       Date   : 2021-11-03 20:22 UTC (2 hours ago)
        
       | kadoban wrote:
       | I'd look into DDC (ddcutil looks like the tool I've used myself).
       | I've largely used it to switch inputs on monitor(s) and such, I
       | would be somewhat surprised if it can't do what you need.
        
       | thebeardisred wrote:
       | As @kadoban mentioned, DDC/`ddcutil` is the tool you're looking
       | for. They have explicit documentation for the Raspberry Pi
       | (http://www.ddcutil.com/raspberry/) though you'll want to make
       | sure you're running at least a 5.10 kernel if it's an RPi4.
        
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       (page generated 2021-11-03 23:02 UTC)