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[Thatoo <thatoo@xxxxxxxxxxx>]

Thanks to Harris Anggara (harrisanggara) and Daniel Drake (dsdrake)  here, https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1490130 , I could solve my problem by adding this patch to the kernel : 
https://marc.info/?l=linux-input&m=144312209020616&w=2

now i'm using kernel 4.2 for Ubuntu 14.04  with the patch. i changed the
DMI_PRODUCT_NAME with K501LX (because that is my laptop model).

I tried directly with kernel 4.2 because before that, kernel 3.19 and so, they need a driver for my touchpad. I followed the instruction here to obtain the source of kernel 4.2 for Ubuntu 14.04, https://wiki.ubuntu.com/Kernel/Dev/KernelGitGuide
git clone git://kernel.ubuntu.com/ubuntu/ubuntu-trusty.git
then from inside the folder you've just downloaded (cd ubuntu-trusty)
git tag -l Ubuntu-*
to know what is available for ubuntu 14.04
and then
git checkout -f -b temp Ubuntu-lts-4.2.0-6.6_14.04.1.1

After, to build the kernel, I followed this explanation, https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel
fakeroot debian/rules clean
fakeroot debian/rules binary-headers binary-generic
then
cd ..
ls *.deb
    linux-cloud-tools-4.2.0-6-generic_4.2.0-6.6~14.04.1.1_amd64.deb
    linux-headers-4.2.0-6_4.2.0-6.6~14.04.1.1_all.deb
    linux-headers-4.2.0-6-generic_4.2.0-6.6~14.04.1.1_amd64.deb
    linux-image-4.2.0-6-generic_4.2.0-6.6~14.04.1.1_amd64.deb
    linux-image-extra-4.2.0-6-generic_4.2.0-6.6~14.04.1.1_amd64.deb
    linux-tools-4.2.0-6-generic_4.2.0-6.6~14.04.1.1_amd64.deb

I deleted this two files because I don't need them
    linux-cloud-tools-4.2.0-6-generic_4.2.0-6.6~14.04.1.1_amd64.deb
    linux-tools-4.2.0-6-generic_4.2.0-6.6~14.04.1.1_amd64.deb
and finally,
sudo dpkg -i linux*4.2.0-6.6~14.04.1.1*.deb
sudo reboot

Now it works nicely. The touchpad works fine, without the need to
install any driver and I can suspend the activity of my computer and
resume without loosing the touchpad. I hope the patch will be integrated
soon and I won't loose my touchpad again with updates in the future.

Thank you everybody,
Take care, always smiling,

-- 
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https://bugs.launchpad.net/bugs/1504445

Title:
   FocalTech touchpad stops working after suspend

Status in linux package in Ubuntu:
  Triaged

Bug description:
  I have an Asus V502LX the persian version of the Asus K501LX.

  I have Ubuntu 14.04 installed and the kernel 4.1.6 installed. I had to
  install the kernel 4.1.6 to have the touchpad recognised. Under kernel
  3.19.30, as I am running now to file in this bug, the touchpad is
  recognised as a simple mouse (no two fingers scrolling...) and the
  problem I am describing below is also present...

  I noticed one problem. The Focaltech touchpad is not working after
  suspending the computer.

  Here is what I could find about the touchpad in
  /proc/bus/input/devices

  I: Bus=0011 Vendor=0002 Product=0012 Version=0000
  N: Name="FocalTechPS/2 FocalTech FocalTech Touchpad"
  P: Phys=isa0060/serio1/input0
  S: Sysfs=/devices/platform/i8042/serio1/input/input5
  U: Uniq=
  H: Handlers=mouse0 event4
  B: PROP=5
  B: EV=b
  B: KEY=e520 10000 0 0 0 0
  B: ABS=260800000000003

  Before suspending the computer, I can deactivate and activate again
  the touchpad with the hotkey of my keyboard without problem. However,
  once the computer suspended, nothing work to re-activate the touchpad.

  I tried a solution given on internet but it doesn't work properly.

  I created a file here /etc/pm/sleep.d/0000trackpad
  sudo gedit /etc/pm/sleep.d/0000trackpad

  and add the following
  #!/bin/sh
  case "$1" in
      suspend|hibernate)
          modprobe -r psmouse;
      resume|thaw)
          modprobe psmouse;
  esac

  With this file, the computer refuse to suspend. The touchpad keep
  working so it does something but I can't make my computer sleeping...

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.19.0-30-generic 3.19.0-30.34~14.04.1
  ProcVersionSignature: Ubuntu 3.19.0-30.34~14.04.1-generic 3.19.8-ckt6
  Uname: Linux 3.19.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.15
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri Oct  9 12:05:16 2015
  InstallationDate: Installed on 2015-09-26 (12 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  SourcePackage: linux-lts-vivid
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  ApportVersion: 2.14.1-0ubuntu3.15
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  yogo       2073 F.... pulseaudio
   /dev/snd/controlC0:  yogo       2073 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=943b03af-c1bf-489e-8e42-485931fc619c
  InstallationDate: Installed on 2015-09-26 (12 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
   Bus 001 Device 003: ID 8087:07dc Intel Corp. 
   Bus 001 Device 002: ID 04f2:b483 Chicony Electronics Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: ASUSTeK COMPUTER INC. K501LX
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-30-generic.efi.signed root=UUID=37bd087e-a2f6-437e-8d20-b19536eb738a ro quiet splash acpi_osi= vt.handoff=7
  ProcVersionSignature: Ubuntu 3.19.0-30.34~14.04.1-generic 3.19.8-ckt6
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-30-generic N/A
   linux-backports-modules-3.19.0-30-generic  N/A
   linux-firmware                             1.127.15
  Tags:  trusty
  Uname: Linux 3.19.0-30-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo www-data
  _MarkForUpload: True
  dmi.bios.date: 04/16/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: K501LX.203
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: K501LX
  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.:bvrK501LX.203:bd04/16/2015:svnASUSTeKCOMPUTERINC.:pnK501LX:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnK501LX:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: K501LX
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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