I get errors like "cannot set freq 0 to ep 0x86" when I connect the camera. What's wrong?

When you connect the camera it is possible that you see errors like the following in your syslog:

myhost kernel: 1:3:1: cannot set freq 0 to ep 0x86
myhost kernel: 1:3:2: cannot set freq 0 to ep 0x86
myhost kernel: 1:3:3: cannot get freq at ep 0x86

These messages do not originate from the UVC driver but are instead printed by the USB Audio Class driver (snd-usb-audio). They do not have any negative effect on either video and audio functions of your webcam. So, no need to worry!