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If I insert a new audio device it shows up under the Hardware Tab of Sound Settings:

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However, I don't see it as an option in Input or Output Tab:

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Another oddity is that when I click "Test Speakers" with Analog Stereo Duplex selected it shows 7 channels to test instead of just "left right" – Kyle Brandt Mar 12 '12 at 15:12

Discovered a workaround. If I open up a terminal and run killall pulseaduio (without elevated privileges) the device then appears in the output tab once pulseaudio restarts itself.

Clearly not a solution or an ideal workaround.

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Looks like a regression – Kyle Brandt Mar 12 '12 at 15:16

Try to change Profile for your device under the Hardware Tab of Sound Settings. For Plantronics it mast be "Analog Output + Mono Input" instead of "Analog Stereo Duplex"

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That isn't an option, if I change it to Analog Stereo Output it still doesn't show up though. – Kyle Brandt Mar 12 '12 at 15:09
Look for some profile in the list, which include Input option, not only Output – Denis Mar 12 '12 at 16:16

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