Comment 6 for bug 974830

For the external monitor lockup, you might try this ppa:
   https://launchpad.net/~sarvatt/+archive/sru6

This contains the following upstream patch, which fixes a common failure on ext. monitor hotplug.
   http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=1c2932e9cb283942567c3dd2695d03b8045da27f