How to get AirPlay to work with dedicated graphics card

[Cassio]

You need a Sandy Bridge or Ivy Bridge CPU with Intel HD 3000 or HD 4000 integrated GPU and it must be enabled. The AirPlay capability relies on the hardware encode/decode function (known as Intel Quick Sync) in order to work. For those who use the integrated graphics as the only GPU, AirPlay should work out of the box. If you are using a dedicated graphics card, you won't be able to use AirPlay by default, you need to enable the integrated GPU and set it as the primary graphics device in BIOS.

If you don't have a display connected to the integrated GPU, the screen will be blank during boot as it's not connected to the primary graphics device, but once OS X loads it will turn on.

Thanks to rcork for the info.

http://www.insanelymac.com/forum/index.php?showtopic=280097