Same problem here.
uname -a
Linux macchina15 4.2.0-34-generic #39-Ubuntu SMP Thu Mar 10 22:13:01 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux
:~$ xinput --list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ ELAN1000:00 04F3:0401 id=11 [slave pointer (2)]
⎜ ↳ SONiX USB Device id=15 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Power Button id=6 [slave keyboard (3)]
↳ Video Bus id=7 [slave keyboard (3)]
↳ Video Bus id=8 [slave keyboard (3)]
↳ Sleep Button id=9 [slave keyboard (3)]
↳ USB2.0 VGA UVC WebCam id=10 [slave keyboard (3)]
↳ Asus WMI hotkeys id=12 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=13 [slave keyboard (3)]
↳ SONiX USB Device id=14 [slave keyboard (3)]
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https://bugs.launchpad.net/bugs/1540051
Title:
ASUS R556U or X555UF , touchpad work but does not recognize two-
finger-tap as middle mouse button
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