Public bug reported:

Description:    Ubuntu 14.04.1 LTS
Release:        14.04
Kernel: 3.13.0-44-generic #73-Ubuntu SMP Tue Dec 16 00:22:43 UTC 2014 x86_64 
x86_64 x86_64 GNU/Linux

After udating my system and rebooting, I noticed that the two-finger
scrolling had stopped working. When I checked the "Mouse and Touchpad"
settings, only a mouse was listed.

xinput returns:
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ PS/2 Synaptics TouchPad                   id=13   [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)]
    ↳ Power Button                              id=8    [slave  keyboard (3)]
    ↳ Sleep Button                              id=9    [slave  keyboard (3)]
    ↳ HD WebCam                                 id=11   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=12   [slave  keyboard (3)]
    ↳ Acer WMI hotkeys                          id=14   [slave  keyboard (3)]

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: kernel-bug mouse synaptics touchpad

** Summary changed:

- Synaptics Touchpad not detected as touchpad in "Mouse and Touchpad" settings 
after updating kernel to 3.13.0-44-generic on Acer Aspire E5-471
+ Synaptics Touchpad not detected as touchpad in "Mouse and Touchpad" settings 
after updating kernel to 3.13.0-44-generic on Acer Aspire E5-471, two-finger 
scrolling not working

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https://bugs.launchpad.net/bugs/1409919

Title:
  Synaptics Touchpad not detected as touchpad in "Mouse and Touchpad"
  settings after updating kernel to 3.13.0-44-generic on Acer Aspire
  E5-471, two-finger scrolling not working

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