Comment 4 for bug 978109

Ok, so I had a look and it does not look like commenting out "required = volume" in analog-input.conf would cause many false positives, so I believe it's worth a try - i e, it probably fixes more machines than it breaks, and the potential breakage is not too bad (it will just show an extra port).

So far I have only heard of this happening on the input side, so limiting this bug to target input ports. I guess the same could happen on the output side, but without any hardware to prove it I'm not happy about doing something similar there.