Hi Folks,
This is my first time doing anything kernel-related, so apologies in advance for any faux-pas which are to follow. I hope this is at least going to the correct place!
Currently after setting the sample rate of USB devices the driver tries to get the sample rate back from the device, to check that the two match up. The Lifecam doesn't support getting the sample rate, and so this operation times-out, and we continue regardless.
Because the USB timeout is pretty long this causes issues with some apps, which begin to doubt the ability of the device to produce audio before the timeout is up and misbehave in various ways. See https://www.google.co.uk/search?q=%22cannot+get+freq+at+ep+0x82%22 for a range of reports relating to this issue.
This patch adds a quirk so that rather than check the sample rate and timeout, we don't bother checking at all.
Hope this all looks okay.
Cheers, Joe