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    It can be done with udev. What is your kernel version? Are you using KMS (kernel mode setting)? Commented May 25, 2011 at 16:00
  • Thanks for the answer. I am not sure about KMS, but as I said in the question, udev doesn't send any events. (udevadm monitor --property does not react at all) Commented May 25, 2011 at 16:27
  • @Andy: the last time this came up, it seemed that most systems required polling. If you've found a way to trigger a udev event, could you answer that question? Commented May 25, 2011 at 23:03
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    I finally got it running loading i915 as kernel module. Commented May 29, 2011 at 12:13
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    You can use xrandr or disper to detect if external monitor has been plugged in. github.com/wertarbyte/autorandr can show you how to use them. But xrandr/disper might not supported your video card. Commented Dec 5, 2011 at 10:33