In case it helps anyone else, here's how I get it to work again if I
accidentally "upgrade" back to the broken version:

Download these files to your desktop

https://launchpad.net/~sarvatt/+archive/sru1/+build/3118995/+files/xserver-xorg-input-evdev-dev_2.6.99.901-1ubuntu3~lp921236_all.deb
https://launchpad.net/~sarvatt/+archive/sru1/+build/3118995/+files/xserver-xorg-input-evdev-udeb_2.6.99.901-1ubuntu3~lp921236_i386.udeb
https://launchpad.net/~sarvatt/+archive/sru1/+build/3118995/+files/xserver-xorg-input-evdev_2.6.99.901-1ubuntu3~lp921236_i386.deb

In a terminal, cd to your Desktop
Then do 
dpkg -i --force-downgrade 
xserver-xorg-input-evdev-dev_2.6.99.901-1ubuntu3~lp921236_all.deb
dpkg -i --force-downgrade 
xserver-xorg-input-evdev-udeb_2.6.99.901-1ubuntu3~lp921236_i386.udeb
dpkg -i --force-downgrade 
xserver-xorg-input-evdev_2.6.99.901-1ubuntu3~lp921236_i386.deb

Logout & log back in again

Then you can delete those downloaded files

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https://bugs.launchpad.net/bugs/992778

Title:
  Dual Monitor Freeze after changing Display Settings in ubuntu 12.04

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