Cristopher, I followed your request and installed the upstream kernel:

$ uname -r
3.18.0-031800rc4-generic

There was no evident change whatsoever in the behaviour of the notebook:
I run sudo apt-get upgrade, but no new drivers were installed. Finally,
the result of xinput did not change:

$ sudo xinput list
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ Logitech USB Receiver                     id=9    [slave  pointer  (2)]
⎜   ↳ Logitech USB Receiver                     id=10   [slave  pointer  (2)]
⎜   ↳ PS/2 Logitech Wheel Mouse                 id=14   [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)]
    ↳ Sleep Button                              id=8    [slave  keyboard (3)]
    ↳ USB2.0 HD UVC WebCam                      id=11   [slave  keyboard (3)]
    ↳ Asus WMI hotkeys                          id=12   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=13   [slave  keyboard (3)]


** Tags added: kernel-fixed-upstream-3.18-rc4

** Tags removed: kernel-fixed-upstream-3.18-rc4
** Tags added: kernel-exists-upstream-3.18-rc4

** Tags removed: kernel-exists-upstream-3.18-rc4
** Tags added: kernel-bug-exists-upstream-3.18-rc4

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1390857

Title:
  [Asus X751LA] Touchpad not recognised in Ubuntu 14.04

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  The touchpad is currently working as a PS/2 mouse, however this
  prevents from using synaptics/syndaemon to suspend touching while
  typing, and double finger scrolling. The only solution is to toggle
  the PS/2 mouse off and use an external mouse.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-39-generic 3.13.0-39.66
  ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
  Uname: Linux 3.13.0-39-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  bojana     1614 F.... pulseaudio
   /dev/snd/controlC0:  bojana     1614 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Nov  9 09:15:22 2014
  HibernationDevice: RESUME=UUID=5fabcd3b-32e7-44db-8929-a165a765caa6
  InstallationDate: Installed on 2014-10-28 (11 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 
(20140722.2)
  MachineType: ASUSTeK COMPUTER INC. X751LA
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-39-generic.efi.signed 
root=UUID=8edce97c-86bb-4f61-85fb-d8f4c1313aeb ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-39-generic N/A
   linux-backports-modules-3.13.0-39-generic  N/A
   linux-firmware                             1.127.8
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/07/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X751LA.302
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X751LA
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrX751LA.302:bd02/07/2014:svnASUSTeKCOMPUTERINC.:pnX751LA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX751LA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: X751LA
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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