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[Martyn <martyn_berry@xxxxxxxxxxxxxxxx>]

My E7440 Laptop is 18 months old, I have seen the problem for about a year with 14.0.4, 15.04, and 15.10,
The problem was such a nuisance that I had abandoned both 14.0.4, and 15.04 after trying each version for about 1 week  each.


Have tried downloading the mainline kernel according to the link,  I think I have done it correctly, but info was not exactly as link.

I downloaded the 3 files and run the command line instruction.
This resulted in3 extra options appearing in the GRUB boot-loader under the Advanced options for Ubuntu tab;
Ubuntu with linux 4.3.0-040300-generic
Ubuntu with linux 4.3.0-040300-generic(upstart)
Ubuntu with linux 4.3.0-040300-generic(recovery mode)

I have used the "Ubuntu with linux 4.3.0-040300-generic" option to start Ubuntu,
The problem still happens the same as before, even  when I start up wiith the new kernel,

>
Dell E7440 touchpad works correctly when freshly started each time; but after some time running the mouse pointer starts to randomly jumps position when I try to use the touchpad. 
Once it occurs the problem is so bad that cannot use laptop with touchpad and need to shutdown.

If I shut down Ubuntu and re-start after about 10 seconds, the problem is temporarily resolved.
Both the USB Mouse and keyboard blue joy-button continue to work correctly while having "jumpy touchpad problem. 
>

More details on problem,
It only seems to effect cursor vertical motion from touchpad control, and has the effect that when trying to place cursor on an object, the cursor  initially moves well towards the object, but when I slow down movement to finely  position on object, the cursor jumps away in a vertical direction (down if approach from below, upward if approached from above}


Having seen "penalvch" comment on the outdated bios on my laptop, I
updated  to the latest bios( a-16) three days ago.

The problem is still happening on A-16 bios and using kernel
4.3.0-040300

-- 
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1513914

Title:
  Dell E7440 touchpad jumps position

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu 15.10 - Dell E7440 touchpad works correctly when freshly started each time; but after some time running the mouse pointer starts to randomly jumps position when I try to use the touchpad.
  If I shut down Ubuntu and re-start after about 10 seconds, the problem is temporarily resolved.
  Both the USB Mouse and keyboard blue joy-button continue to work correctly while having "jumpy touchpad problem.
  Running Ubuntu 15.10 installed version (updated from 15.04 new installation)
  I have previously seen the same same problem with Ubuntu 14.04 and 15.04, both live CD and installed versions.
  I am new to Linux & forums, so please excuse my lack of knowledge.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-16-generic 4.2.0-16.19
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  martyn     1217 F.... pulseaudio
   /dev/snd/controlC0:  martyn     1217 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Nov  6 17:33:42 2015
  HibernationDevice: RESUME=UUID=d0cf60ae-c48f-4267-bb58-af4193cc2e5c
  InstallationDate: Installed on 2015-09-23 (44 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Dell Inc. Latitude E7440
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic root=UUID=42d901b2-6e43-4fbf-a79f-c6329d47548a ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-16-generic N/A
   linux-backports-modules-4.2.0-16-generic  N/A
   linux-firmware                            1.149.1
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-10-22 (14 days ago)
  dmi.bios.date: 02/02/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A14
  dmi.board.name: 03M26R
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA14:bd02/02/2015:svnDellInc.:pnLatitudeE7440:pvr01:rvnDellInc.:rn03M26R:rvr:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E7440
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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