Public bug reported:

In my Lenovo ideapad 700, the touchpad is not working anymore, It's
completely unresponsive. I've last used it a couple of days ago
(2017/08/26).

Today when I checked the system settings, all settings related to the
touchpad have vanished. External mouse works properly though. I've tried
few commands but it seems that the system doesn't recognize the touchpad
anymore:

 $ xinput --list
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ Microsoft Microsoft 5-Button Mouse with IntelliEye(TM)    id=10   [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)]
    ↳ Lenovo EasyCamera                         id=11   [slave  keyboard (3)]
    ↳ Ideapad extra buttons                     id=12   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=13   [slave  keyboard (3)]

Note: The entry "Microsoft... Mouse..." the mouse I'm using as workaround
 
OS and kernel versions:
$ uname -amoving
Linux zoua-machine 4.10.0-32-generic #36-Ubuntu SMP Tue Aug 8 12:10:06 UTC 2017 
x86_64 x86_64 x86_64 GNU/Linux
$ cat /etc/*release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=17.04

As per https://wiki.ubuntu.com/DebuggingTouchpadDetection#generalinfo
I've attached the /proc/bus/input/devices the dmeg and the Xorg.0.log

As for the context, a couple of days ago I've disabled the touchpad "tap
to click" feature because my hands kept touching it while typing causing
the cursor to fly from line to line... On the next login the touchpad
stopped working and disappeared from system settings.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "touhpad_issue.tar"
   
https://bugs.launchpad.net/bugs/1713476/+attachment/4940085/+files/touhpad_issue.tar

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https://bugs.launchpad.net/bugs/1713476

Title:
  Touchpad not recongnized anymore in Lenovo ideapad 700 15ISK

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