https://bugs.freedesktop.org/show_bug.cgi?id=54675
--- Comment #3 from Chris Rankin rankincj@googlemail.com 2012-09-09 00:17:26 UTC --- According to alsamixer, my HD4670 only has a S/PDIF playback device. However, my HD4890 has both S/PDIF and PCM playback devices. I don't know whether this is significant.