I am experiencing the same problem  after upgrading to 11.10.
I have a logitech webcam :

Bus 002 Device 006: ID 046d:08c3 Logitech, Inc. Camera (Notebooks Pro)

Sound is muted, 
no sound device is reported in the sound menu, 
banshee crashes
Firefox is  much slower (video with sound playing in youtube)

I get two messages in kern.log :

   3:3:3: cannot set freq 16000 to ep 0x86
   3:3:3: usb_set_interface failed

The problem is appears randomly but quite often.

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https://bugs.launchpad.net/bugs/459445

Title:
  no sound // 3:3:1: cannot set freq 16000 to ep 0x86

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