Comment 4 for bug 1465506

I get the same error when waking up from suspend. Have two monitors (HDMI, DVI) connected through Lenovo docking station.

$ lsb_release -rd
Description: Ubuntu 14.04.2 LTS
Release: 14.04
$ uname -a
Linux raccoon 3.19.0-20-generic #20~14.04.1-Ubuntu SMP Fri May 29 19:33:06 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

$ apt-cache policy xserver-xorg-video-intel
xserver-xorg-video-intel:
  Installed: 2:2.99.917+git20150528.fb1643f0-0ubuntu0sarvatt~trusty
  Candidate: 2:2.99.917+git20150528.fb1643f0-0ubuntu0sarvatt~trusty
  Version table:
 *** 2:2.99.917+git20150528.fb1643f0-0ubuntu0sarvatt~trusty 0
        500 http://ppa.launchpad.net/xorg-edgers/ppa/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status
     2:2.99.910-0ubuntu1.6 0
        500 http://at.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
     2:2.99.910-0ubuntu1 0
        500 http://at.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages