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I have a Dell Venue Pro 7140 with the keyboard/trackpad/extra battery
dock.  PopOS 20.04 fully updated.  I have experienced this bug on stock
Ubuntu 20.04 as well as Kubuntu 20.04.

  When at the login page, the trackpad and keyboard operate as they
should.  Once the login process is complete and the desktop is
displayed, the keyboard still works as expected but the trackpad no
longer controls the pointer.  The touch display still functions as
expected but the trackpad on the keyboard dock doesn't work.

The attached document is my device list, here is the evtest:

Input driver version is 1.0.1
Input device ID: bus 0x3 vendor 0x6cb product 0x2819 version 0x111
Input device name: "Synaptics T Pad V 01.31 Touchpad"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 272 (BTN_LEFT)
    Event code 325 (BTN_TOOL_FINGER)
    Event code 330 (BTN_TOUCH)
    Event code 333 (BTN_TOOL_DOUBLETAP)
    Event code 334 (BTN_TOOL_TRIPLETAP)
  Event type 3 (EV_ABS)
    Event code 0 (ABS_X)
      Value    483
      Min        0
      Max     1056
      Resolution      12
    Event code 1 (ABS_Y)
      Value    266
      Min        0
      Max      516
      Resolution      12
    Event code 47 (ABS_MT_SLOT)
      Value      0
      Min        0
      Max        2
    Event code 53 (ABS_MT_POSITION_X)
      Value      0
      Min        0
      Max     1056
      Resolution      12
    Event code 54 (ABS_MT_POSITION_Y)
      Value      0
      Min        0
      Max      516
      Resolution      12
    Event code 55 (ABS_MT_TOOL_TYPE)
      Value      0
      Min        0
      Max        2
    Event code 57 (ABS_MT_TRACKING_ID)
      Value      0
      Min        0
      Max    65535
  Event type 4 (EV_MSC)
    Event code 5 (MSC_TIMESTAMP)
Properties:
  Property type 0 (INPUT_PROP_POINTER)
  Property type 2 (INPUT_PROP_BUTTONPAD)
Testing ... (interrupt to exit)

I did try to remove xserver-xorg-input-synaptics, but it is not
installed on 20.04.

There is still an issue with Wayland and the trackpad, but it's different than 
Xorg so the problem may be in how Xorg is processing the trackpad (I honestly 
don't know) - in Wayland, it will work until I attempt to run the sofware 
center.
--- 
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
DistUpgraded: Fresh install
DistroCodename: focal
DistroRelease: Pop!_OS 20.04
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation HD Graphics 5300 [8086:161e] (rev 09) (prog-if 00 [VGA 
controller])
   Subsystem: Dell HD Graphics 5300 [1028:066b]
MachineType: Dell Inc. Venue 11 Pro 7140
Package: xorg-server (not installed)
ProcKernelCmdLine: 
initrd=\EFI\Pop_OS-70755969-68c4-4da9-982b-a38628a19db0\initrd.img 
root=UUID=70755969-68c4-4da9-982b-a38628a19db0 ro quiet loglevel=0 
systemd.show_status=false splash
ProcVersionSignature: Ubuntu 5.4.0-7626.30~1588169883~20.04~bbe668a-generic 
5.4.30
Tags:  focal ubuntu ubuntu
Uname: Linux 5.4.0-7626-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
 
_MarkForUpload: True
dmi.bios.date: 09/10/2018
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A17
dmi.board.name: 0XMVMH
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA17:bd09/10/2018:svnDellInc.:pnVenue11Pro7140:pvr:rvnDellInc.:rn0XMVMH:rvrA00:cvnDellInc.:ct8:cvr:
dmi.product.name: Venue 11 Pro 7140
dmi.product.sku: 066B
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

** Affects: libinput (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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


** Tags: apport-collected bot-comment focal ubuntu
-- 
[Dell Venue 11 Pro 7140] Trackpad does not work in Xorg sessions
https://bugs.launchpad.net/bugs/1877655
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