Intentional by design; see the cs46xx recording FAQ on the ALSA wiki.
** Changed in: alsa-driver (Ubuntu)
Status: Needs Info => Rejected
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Can't record from microphone with snd-cs46xx
https://launchpad.net/bugs/49908
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This issue is a FAQ for this audio codec and chipset.
You need to unmute the element from which you're recording in addition
to selecting [and/or unmuting] 'Capture', 'Line', and 'ADC'. These last
three elements also need to be set to capture. (If you're recording from
a 'Mic', then substitute it
