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USB Audio devices not recognized

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Joined
Jan 21, 2011
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Motherboard
Gigabyte H55M-USB3
CPU
i7 > Need full model number > See Rules!
Graphics
Nvidia > Need full model number > See Rules!
Mac
  1. iMac
  2. MacBook Pro
Classic Mac
  1. iMac
Mobile Phone
  1. iOS
Motherboard: Gigabyte H55M-USB3
OS X 10.8.2

Everything seems to be running fine, except that USB audio devices are not recognized as such. By that I mean, they appear on the list of devics when looking at a system report on About this Mac..., but System Settings -> Sound does not show them (for example, if I plug in a Logitech camera with a mic, Facetime can use it for video, but there's not input device associated with it, or if I plug in a USB audio card I see it listed by the proper name on the system profiler, but sound settings do not show it).

Any ideas?
 
In case someone runs across this thread and is interested in the solution: installing the AppleUSBAudio.kext from 10.8.0 restored audio USB devices functionality.
 
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