I just downloaded the source to the newest stable kernel from
kernel.org, manually added the line that fixes this bug with a text
editor and followed this guide to compile it:
https://wiki.ubuntu.com/KernelTeam/GitKernelBuild

It's way more fun this way and you'll have the freshest stable kernel!
I've been using this method since early august and it has been working
out fine. But once 17.10 comes out I suppose this won't be a problem
anymore..

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https://bugs.launchpad.net/bugs/1700657

Title:
  Touchpad not detected in Lenovo X1 Yoga / Yoga 720-15IKB

Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Zesty:
  Fix Committed

Bug description:
  SRU Justification:
  [Impact]
  Touchpad on Lenovo X1 Yoga / Yoga 720-15IKB does not work.

  [Test Case]
  Touchpad doesn't work on the system.
  With the patch, touchpad works.

  [Regression Potential]
  Minimal. The it adds a device ID to intel-lpss-pci, so it's limited to
  one device.

  ---

  Touchpad is not automatically detected in 14.04, 16.04 or 17.04. I
  tried in live mode and after full installation. I was able to connect
  an external mouse and a bluetooth mouse and both worked. I checked my
  xinput list and no sign:

  ⎡ Virtual core pointer                        id=2    [master pointer
  (3)] ⎜   ↳ Virtual core XTEST pointer                  id=4    [slave
  pointer  (2)] ⎜   ↳ Wacom HID 50FE Finger touch                 id=12
  [slave  pointer  (2)] ⎜   ↳ Wacom HID 50FE Pen stylus
  id=13    [slave  pointer  (2)] ⎜   ↳ Wacom HID 50FE Pen eraser
  id=16    [slave  pointer  (2)] ⎜   ↳ byron's trackpad
  id=17    [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)]    ↳ Power Button
  id=9    [slave  keyboard (3)]    ↳ Apple Inc. Magic Keyboard
  id=10    [slave  keyboard (3)]    ↳ EasyCamera
  id=11    [slave  keyboard (3)]    ↳ Ideapad extra buttons
  id=14    [slave  keyboard (3)]    ↳ AT Translated Set 2 keyboard
  id=15    [slave  keyboard (3)]

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: linux-image-4.10.0-24-generic 4.10.0-24.28
  ProcVersionSignature: Ubuntu 4.10.0-24.28-generic 4.10.15
  Uname: Linux 4.10.0-24-generic x86_64
  ApportVersion: 2.20.4-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  byron      1794 F.... pulseaudio
  CurrentDesktop: Unity:Unity7
  Date: Mon Jun 26 16:51:37 2017
  InstallationDate: Installed on 2017-06-26 (0 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  MachineType: LENOVO 80X7
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-24-generic.efi.signed 
root=UUID=39280165-1a70-4b0d-b1fa-3b01e8bc1e25 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.10.0-24-generic N/A
   linux-backports-modules-4.10.0-24-generic  N/A
   linux-firmware                             1.164
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/12/2017
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 4MCN20WW(V1.06)
  dmi.board.asset.tag: NO Asset Tag
  dmi.board.name: Lenovo YOGA 720-15IKB
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: NO Asset Tag
  dmi.chassis.type: 31
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo YOGA 720-15IKB
  dmi.modalias: 
dmi:bvnLENOVO:bvr4MCN20WW(V1.06):bd04/12/2017:svnLENOVO:pn80X7:pvrLenovoYOGA720-15IKB:rvnLENOVO:rnLenovoYOGA720-15IKB:rvrSDK0J40709WIN:cvnLENOVO:ct31:cvrLenovoYOGA720-15IKB:
  dmi.product.name: 80X7
  dmi.product.version: Lenovo YOGA 720-15IKB
  dmi.sys.vendor: LENOVO

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