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[maniuz <1328392@xxxxxxxxxxxxxxxxxx>]

Hi everyone, maybe i've found the solution for this problem. I recently bought an Asus F550LD (which in realty is an X550) and i have some problem, but the strange thing is that when i try the live version of ubuntu 14.04 on this notebook in exposure everything works (or almost). So before changing it, I used the command "sudo lshw -html" and I got the hardware list of pc.
Then when I changed the notebook with the one in exposure i repeat the commandon this one. 
Finally I compared the two hardware cards. There are two difference. one litttle difference on the clock of processor (which is the same) and the Ram. The Ram is the same for power, but different for producer.

I think the problem is the Ram, on which the OS is loaded.

I report the two hardware cards for you.
I hope I was helpful

** Attachment added: "Card HW ASUS good.htm"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1328392/+attachment/4158639/+files/Card%20HW%20ASUS%20good.htm

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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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