I'm getting high pitched, distorted audio out via HDMI on my Gazelle Pro (i4600 GPU) under both 3.13.10 (Deb Jessie) and 3.11.0 (Ubuntu 12.04.4) kernels/OSs.
I've brought this up on the ALSA dev list. This thread https://bugzilla.kernel.org/show_bug.cgi?id=60769 seems to indicate this could be fixed in kernel 3.14 but I've not tried that yet.
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