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Audio through DisplayPort on Dell XPS 13 L322x (Intel GMA 4000)

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http://unix.stackexchange.com – I have the recently released Dell XPS 13 (L322x) and have successfully installed Linux Mint 14 alongside the pre-installed Windows 8. When connecting and external monitor using a DisplayPort to HDMI adapter in Windows 8 the sound is passed just fine to the monitor. In Linux however the only available sound output device are the speakers (and 3,5 mm jack.) I am using Dell's Sputnik PPA with updated kernel. Is there a way of enabling sound output over DisplayPort, or am I just doing things wrong? Relevant lines from lspci 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core proc (HowTos)