@cmcanulty-
You should not need to use 'sudo add-key' at all.  add-key is only relevant for 
older Ubuntu versions (and these backlight PPA's are only for Ubuntu 11.10).  
The best way to add the inverted-backlight PPA (which also includes the 
stuck-backlight fix) is to run these commands in a terminal window:

  sudo add-apt-repository ppa:kamalmostafa/inverted-backlight
  sudo apt-get update
  sudo apt-get dist-upgrade

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https://bugs.launchpad.net/bugs/872652

Title:
  screensaver backlight stuck off, system looks hung

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