Detect when HDMI cable is plugged in Desktop Linux

StackOverflow https://stackoverflow.com/questions/10170415

  •  31-05-2021
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Question

I need to detect when an HDMI cable has been plugged or unplugged. Getting a notification would be best, but polling would also do. I am using Qt (and Qt Creator as IDE). I don't need this to be cross platform, I can use OS-specific system calls.

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Solution

Just from the top of my head: you can write a udev rule which sends a message via dbus to your application.

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