Have been affected by this bug for years now. Can't remember exactly when it 
started, but for sure all subsequent kernel official releases since this time 
have exhibited it, until the current 3.5.0-21-generic #32.
The difference that may happen from one kernel to another is how frequently the 
bug ramdomly occurs on boots.

So I confirm what Marko wrote in his post 
(http://www.techytalk.info/logitech-e3500-webcam-and-cannot-set-freq-16000-to-ep-0x86/)
 :
"Some Logitech web-cams have serious problems all of the last kernel revisions 
(somewhere since 2.6.26 kernel revision)"

Have recently discovered and applied Marko's workaround, described in
his post, just changing the detected string from "cannot set freq 16000
..." to "cannot set freq 48000 ...". Works very well, thanks to him ...

Here is my Logitech Webcam model :

$ lsusb
Bus 001 Device 002: ID 046d:0825 Logitech, Inc. Webcam C270

And a description of my symptoms, under 12.10 (quantal) 64-bit +
3.5.0-21-generic #32 kernel :

I have tons of "cannot set freq 48000 to ep 0x86" in Syslog, and the boot 
randomly hangs very often, more than 50% of times. The login screen appears, 
but without the background theme : it's all blue-purple, and the mouse and 
keyboard (both USB, like the webcam) are unresponsive. Sometimes it suddenly 
unfreezes after a while (10 to 30 seconds or so), but most of the times never : 
I have to hard reset the PC.
The problem disappears if I uninstall the "indicator-sound" package, which 
confirms, like the "unplug during boot" workaround, that the issue with 
Logitech USB webcam is only in startup sequence, at least for me.

I am also glad to see the importance has been set to "high" ...

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https://bugs.launchpad.net/bugs/884210

Title:
  PCI/internal sound not working randomly, random hangs: "cannot set
  freq 16000 to ep 0x86" shown in syslog

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