my fix for this has been merged into master and all stable branches back to v4.4
This issue can be closed now.

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https://bugs.launchpad.net/bugs/1686048

Title:
  Touchpad not detected on Lenovo S21e-20

Status in Linux:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  xinput list
  ⎡ Virtual core pointer                          id=2    [master pointer  (3)]
  ⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
  ⎜   ↳  USB OPTICAL MOUSE                        id=9    [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)]
      ↳ AT Translated Set 2 keyboard              id=11   [slave  keyboard (3)]
      ↳ Lenovo EasyCamera

  cat /proc/bus/input/devices 
  I: Bus=0019 Vendor=0000 Product=0005 Version=0000
  N: Name="Lid Switch"
  P: Phys=PNP0C0D/button/input0
  S: 
Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:01/PNP0C0D:00/input/input0
  U: Uniq=
  H: Handlers=event0 
  B: PROP=0
  B: EV=21
  B: SW=1

  I: Bus=0019 Vendor=0000 Product=0001 Version=0000
  N: Name="Power Button"
  P: Phys=PNP0C0C/button/input0
  S: Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input1
  U: Uniq=
  H: Handlers=kbd event1 
  B: PROP=0
  B: EV=3
  B: KEY=10000000000000 0

  I: Bus=0019 Vendor=0000 Product=0001 Version=0000
  N: Name="Power Button"
  P: Phys=LNXPWRBN/button/input0
  S: Sysfs=/devices/LNXSYSTM:00/LNXPWRBN:00/input/input2
  U: Uniq=
  H: Handlers=kbd event2                                                        
               
  B: PROP=0                                                                     
               
  B: EV=3                                                                       
               
  B: KEY=10000000000000 0                                                       
               
                                                                                
               
  I: Bus=0011 Vendor=0001 Product=0001 Version=ab41
  N: Name="AT Translated Set 2 keyboard"
  P: Phys=isa0060/serio0/input0
  S: Sysfs=/devices/platform/i8042/serio0/input/input3
  U: Uniq=
  H: Handlers=sysrq kbd event3 leds 
  B: PROP=0
  B: EV=120013
  B: KEY=402000000 3803078f800d001 feffffdfffefffff fffffffffffffffe
  B: MSC=10
  B: LED=7

  I: Bus=0019 Vendor=0000 Product=0006 Version=0000
  N: Name="Video Bus"
  P: Phys=LNXVIDEO/video/input0
  S: Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input4
  U: Uniq=
  H: Handlers=kbd event4 
  B: PROP=0
  B: EV=3
  B: KEY=3e000b00000000 0 0 0

  I: Bus=0003 Vendor=15d9 Product=0a4c Version=0111
  N: Name=" USB OPTICAL MOUSE"
  P: Phys=usb-0000:00:14.0-2/input0
  S: 
Sysfs=/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.0/0003:15D9:0A4C.0001/input/input5
  U: Uniq=
  H: Handlers=mouse0 event5 
  B: PROP=0
  B: EV=17
  B: KEY=70000 0 0 0 0
  B: REL=103
  B: MSC=10

  I: Bus=0000 Vendor=0000 Product=0000 Version=0000
  N: Name="HDA Intel PCH Mic"
  P: Phys=ALSA
  S: Sysfs=/devices/pci0000:00/0000:00:1b.0/sound/card0/input6
  U: Uniq=
  H: Handlers=event6 
  B: PROP=0
  B: EV=21
  B: SW=10

  I: Bus=0000 Vendor=0000 Product=0000 Version=0000
  N: Name="HDA Intel PCH Front Headphone"
  P: Phys=ALSA
  S: Sysfs=/devices/pci0000:00/0000:00:1b.0/sound/card0/input7
  U: Uniq=
  H: Handlers=event7 
  B: PROP=0
  B: EV=21
  B: SW=4

  I: Bus=0000 Vendor=0000 Product=0000 Version=0000
  N: Name="HDA Intel PCH HDMI/DP,pcm=3"
  P: Phys=ALSA
  S: Sysfs=/devices/pci0000:00/0000:00:1b.0/sound/card0/input8
  U: Uniq=
  H: Handlers=event8 
  B: PROP=0
  B: EV=21
  B: SW=140

  I: Bus=0003 Vendor=5986 Product=0674 Version=4207
  N: Name="Lenovo EasyCamera"
  P: Phys=usb-0000:00:14.0-3/button
  S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/input/input9
  U: Uniq=
  H: Handlers=kbd event9 
  B: PROP=0
  B: EV=3
  B: KEY=100000 0 0 0

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: linux-image-4.10.0-20-generic 4.10.0-20.22
  ProcVersionSignature: Ubuntu 4.10.0-20.22-generic 4.10.8
  Uname: Linux 4.10.0-20-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.4-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  rob        1146 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Tue Apr 25 11:15:33 2017
  InstallationDate: Installed on 2017-04-25 (0 days ago)
  InstallationMedia: Kubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 005: ID 105b:e065 Foxconn International, Inc. BCM43142A0 
Bluetooth module
   Bus 001 Device 004: ID 5986:0674 Acer, Inc 
   Bus 001 Device 003: ID 15d9:0a4c Trust International B.V. USB+PS/2 Optical 
Mouse
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 80M4
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-20-generic 
root=UUID=b3f71244-6c48-4fcd-82a8-8f2c8c81307d ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.10.0-20-generic N/A
   linux-backports-modules-4.10.0-20-generic  N/A
   linux-firmware                             1.164
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/20/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: C4CN13WW(V1.03)
  dmi.board.asset.tag: NO Asset Tag
  dmi.board.name: Lenovo S21e-20
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0H15298 WIN
  dmi.chassis.asset.tag: NO Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo S21e-20
  dmi.modalias: 
dmi:bvnLENOVO:bvrC4CN13WW(V1.03):bd01/20/2015:svnLENOVO:pn80M4:pvrLenovoS21e-20:rvnLENOVO:rnLenovoS21e-20:rvrSDK0H15298WIN:cvnLENOVO:ct10:cvrLenovoS21e-20:
  dmi.product.name: 80M4
  dmi.product.version: Lenovo S21e-20
  dmi.sys.vendor: LENOVO

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