Joshua,

Do you still have this issue on latest Ubuntu kernel?

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https://bugs.launchpad.net/bugs/1809993

Title:
  Lenovo X1C6 trackpad functions broken

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Summary:
  After kernel update the trackpad advanced functions, like two finger 
scrolling and mouse acceleration have stopped working.

  Expected Result:
  Two finer scroll works and the mouse has acceleration features work

  Actual Result:
  Two finer scroll works and the mouse has acceleration features do not work

  Steps to reproduce:
  1. Lenovo X1C6 (LENOVO 20KHCTO1WW/20KHCTO1WW, BIOS N23ET59W (1.34 ) 
11/08/2018)
  2. Install 18.04 LTS
  3. config-4.15.0-42-generic acceleration works, while 
config-4.15.0-43-generic does not

  This appears to be some sort of regression or change in behavior between 
kernel versions.
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  powersj    1597 F.... pulseaudio
  CurrentDesktop: communitheme:ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  HibernationDevice: RESUME=UUID=1eb43198-8ef5-4035-8b81-74c3e2936ad7
  InstallationDate: Installed on 2018-12-06 (22 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 002: ID 5986:2115 Acer, Inc 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 20KHCTO1WW
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-42-generic 
root=/dev/mapper/ubuntu--vg-root ro
  ProcVersionSignature: Ubuntu 4.15.0-42.45-generic 4.15.18
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-42-generic N/A
   linux-backports-modules-4.15.0-42-generic  N/A
   linux-firmware                             1.173.2
  RfKill:
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  Tags:  bionic
  Uname: Linux 4.15.0-42-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip libvirt lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 11/08/2018
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N23ET59W (1.34 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20KHCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN23ET59W(1.34):bd11/08/2018:svnLENOVO:pn20KHCTO1WW:pvrThinkPadX1Carbon6th:rvnLENOVO:rn20KHCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad X1 Carbon 6th
  dmi.product.name: 20KHCTO1WW
  dmi.product.version: ThinkPad X1 Carbon 6th
  dmi.sys.vendor: LENOVO

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