Comment 62 for bug 1581088

I am still using Ubuntu 14.04 (on a MacBook Air). I have a Logitech wireless mouse M185, like the OP, and have just noticed the same problem: the middle button (wheel) is no longer recognized (checked with xev). Scrolling up and down (buttons 4 and 5) work fine. So this problem was presumably introduced with a recent kernel release. I am currently using 3.13.0-110-generic. Unfortunately, I was travelling without the mouse, so I don't know if the problem was introduced in -109 or -110, but I am sure that 3.13.0-108-generic was okay. (I strongly suspect -109 was okay too, because I was back home for a day or two before the upgrade to -110, and I didn't notice a problem.) I hope that helps isolate where the problem was introduced. Let me know if any other information could be useful.