Comment 73 for bug 1018020

Same issue here with a Logitech webcam. System hangs on startup (after entering password in gdm to start gnome 3, but gdm startup is also terribly slow), printing the "cannot set freq" messages.
Unplugging the webcam unlocks the system immediately.
This does not appear on *every* boot, could not reproduce why or why not.

# uname -a
Linux snake 3.8.5-1-ARCH #1 SMP PREEMPT Fri Mar 29 19:18:14 CET 2013 x86_64 GNU/Linux

# lsusb
Device: Bus 001 Device 004: ID 046d:0825 Logitech, Inc. Webcam C270
(with -v): http://pastebin.com/5ZFCHwrk

# dmesg |grep freq
[ 3.536882] 3:3:2: cannot set freq 24000 to ep 0x86
[ 4.534103] 3:3:3: cannot set freq 32000 to ep 0x86
[ 5.531430] 3:3:4: cannot set freq 48000 to ep 0x86
[ 17.997410] 3:3:4: cannot set freq 48000 to ep 0x86
(...)
[ 33.957226] 3:3:4: cannot set freq 48000 to ep 0x86
[ 34.954442] 3:3:4: cannot set freq 48000 to ep 0x86
(...and over 9000 more)