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[nilesh <chatenilesh@xxxxxxxxx>]

I don't know for touchpad but if EXTERNAL USB MOUSE isn't working try
this

1. Open the Terminal :   ctrl+alt+t
2. cd /etc/modprobe.d/
3. sudo gedit options.conf
4. Type the following in the file which is opened by previous command:
    options psmouse proto=imps
5 .Save the file and close it.
6. sudo modprobe -r psmouse
7. sudo modprobe psmouse

And its done.

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https://bugs.launchpad.net/bugs/1328392

Title:
   [Asus X550LD] Touchpad not working - Ubuntu 14.04

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  Touchpad on the Asus X550LD is not working on Ubuntu 14.04 with either
  default or mainline kernel 3.15.0-031500-generic.

  Cursor does make some movements if you insist toying and clicking on
  the touchpad, but only seldomly (just using it normally often would
  produce no move), and in a direction that apparently has no relation
  with touch. Generally moves towards bottom, bottom/left, but insisting
  one can have patchy movements in other directions. However, clicking
  has no effect.

  Mouse connected with USB works normally, until you try to use the
  touchpad. If you touch the touchpad, the cursor mostly keeps on moving
  as per the mouse, but click mostly does not work. Logging out and
  logging in or restarting fixes the problem.

  WORKAROUND: Use external USB mouse but don't touch the touchpad.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-29-generic 3.13.0-29.53
  ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
  Uname: Linux 3.13.0-29-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  g          1530 F.... pulseaudio
   /dev/snd/controlC0:  g          1530 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Tue Jun 10 08:18:41 2014
  HibernationDevice: RESUME=UUID=205b0b44-7997-42f7-806d-3b367ebfdceb
  InstallationDate: Installed on 2014-06-09 (0 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  MachineType: ASUSTeK COMPUTER INC. X550LD
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-29-generic.efi.signed root=UUID=ee58b2b6-1d8c-4137-beca-6a52a4634265 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-29-generic N/A
   linux-backports-modules-3.13.0-29-generic  N/A
   linux-firmware                             1.127.2
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/17/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X550LD.300
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X550LD
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: ATN12345678901234567
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX550LD.300:bd01/17/2014:svnASUSTeKCOMPUTERINC.:pnX550LD:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX550LD:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: X550LD
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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