Ubuntu
xserver-xorg-video-intel package

  1. Bug #1263681
  2. Comment #4

Comment 4 for bug 1263681

Revision history for this message
Marius Gedminas (mgedmin) wrote : Re: DisplayPort hotplugging is not detected on a ThinkPad X220

Managed to update the BIOS at last (by following the advice from http://www.floccinaucinihilipilification.net/blog/2011/10/2/updating-the-bios-of-a-thinkpad-x220-using-linux.html).

    $ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
    8DET69WW (1.39 )
    07/18/2013

DisplayPort hotplugging continues to not work.