The bug still exists in yesterday's trusty daily image.

Specifically, test #1:
1. booted the daily image from USB
2. plugged in DisplayPort cable
3. nothing happened
4. ran xrandr in a terminal, external display was detected

Test #2:
1. plugged in DisplayPort cable
2. booted the daily image
3. had an extended desktop right from the beginning
4. unplugged the cable, desktop was reconfigured instantly
5. plugged the cable back, the hotplug was detected(!) and unity went back to 
extended desktop
6. unplugged the cable again, waited a bit longer
7. plugged the cable back in, nothing happened (and nothing continues to 
happen, several minutes later)

Will boot kernel v3.13-rc7-trusty from http://kernel.ubuntu.com/~kernel-
ppa/mainline/?C=N;O=D next

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https://bugs.launchpad.net/bugs/1263681

Title:
  DisplayPort hotplugging is not detected on a ThinkPad X220

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