I had a noisy headphone port on a slightly older XPS 15. There was a simple `echo 1 > ???` fix, but I have no recollection of the specifics. I could probably lo

I had a noisy headphone port on a slightly older XPS 15. There was a simple `echo 1 > ???` fix, but I have no recollection of the specifics. I could probably look for it if someone else has the problem and needs it, though there's no guarantee that the new XPS 13 would be fixed the same way.