Comment 4 for bug 669219

hrw just had a problem with this on his custom built kernel and solved it by loading the module.

I assume then, that udev has to see a plug event from the kernel audio module being loaded or it will not set the ACLs on it?

This does not explain the video not working: the Smartbook has a USB UVC webcam, that said it is always turned on and plugged in as a built-in device.

Is this because these modules are either loaded before udev runs or basically present before udev runs? Do we need USB as a module to make this work and push it all down to automagic probing of devices?