Detect the number of monitors when xrandr doesn't detect when the monitor is off

• xplugd

  2 64 2.7 C

  Monitor, keyboard, and mouse plug/unplug helper for X

I'm not sure about turning on or off, but there is a very nice project, https://github.com/troglobit/xplugd, that keeps a daemon running and reacting to when a display is connected or disconnected, or a keyboard or a mouse, and then runs a shell script which you can then run xrandr commands, for example. It won't be triggered on turning a monitor on or off, but it will work on disconnecting or connecting. It is also does not depend on your window manager, doesn't matter if it is Qtile or something else. It is a nice project, I use and really like it, but I'm not sure it is 100% what you want here. ):

• ddcutil

  47 858 9.9 C

  Control monitor settings using DDC/CI and USB

Not sure if it can detect on/off but this might work: https://www.ddcutil.com/

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