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[George Moutsopoulos <1379450@xxxxxxxxxxxxxxxxxx>]

Description of my bug is mouse does not work at all. Device is elantech ETD0108. Laptop is Asus TP500LN. Dmesg gives "lost sync at byte 6" messages. Mouse does work with proto=imps parameter but no two-finger functionality. If this is the same with you, after sudo su try
echo 1 > /sys/devices/platform/i8042/serio4/reg_07
(or serioX?)
and see if it fixes the issue.

For at least asus TP500LN a kernel patch is under consideration
https://bugzilla.kernel.org/show_bug.cgi?id=84491
https://www.marc.info/?t=142731893400011
Many thanks to Ulrik de Bie!

Perhaps you can post on bugzilla that it affects your laptop too.

** Bug watch added: Linux Kernel Bug Tracker #84491
   http://bugzilla.kernel.org/show_bug.cgi?id=84491

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https://bugs.launchpad.net/bugs/1379450

Title:
  Touchpad on ASUS X750LN notebook doesn't work on Ubuntu

Status in linux package in Ubuntu:
  Triaged

Bug description:
  The touchpad on my ASUS X750LN notebook (modell R751LN-T4102H) doesn't work on Ubuntu 14.04.1 LTS.
  It seems to me, that the touchpad is not recognized by linux. It works completely under Windows 8.1. An USB mouse works fine under linux.

  The keyboard Fn key also doesn't work on linux.

  On Windows I found this information, which may be helpful. It is not
  the original text since I translated it from german.

  Manufacturer: ASUS
  Location: plugged into PS/2 mouse port

  Hardware-IDs:
  ACPI\VEN_ETD&DEV_0108
  ACPI\ETD0108
  *ETD0108

  Compatible-IDs:
  *PNP0F13

  BIOS device name
  \_SB.PCI0.LPCB.PS2M

  Driver:

  C:\Windows\system32\DRIVERS\AsusTP.sys
  C:\Windows\system32\DRIVERS\i8042prt.sys
  C:\Windows\system32\DRIVERS\mouclass.sys

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-36-generic 3.13.0-36.63
  ProcVersionSignature: Ubuntu 3.13.0-36.63-generic 3.13.11.6
  Uname: Linux 3.13.0-36-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dirk       1677 F.... pulseaudio
   /dev/snd/controlC1:  dirk       1677 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Oct  9 19:15:05 2014
  HibernationDevice: RESUME=UUID=906c18c8-0871-4d8a-b7f6-35aaca3eb005
  InstallationDate: Installed on 2014-10-08 (0 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: ASUSTeK COMPUTER INC. X750LN
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-36-generic.efi.signed root=UUID=b3e6e618-b559-412b-b8bd-f6357930fb03 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-36-generic N/A
   linux-backports-modules-3.13.0-36-generic  N/A
   linux-firmware                             1.127.7
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/19/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 201
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: X750LN
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr201:bd02/19/2014:svnASUSTeKCOMPUTERINC.:pnX750LN:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX750LN:rvr1.0:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: X750LN
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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