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[Sun HAHM <hsseek@xxxxxxxxx>]

I guessed it was in BIOS, too. First I tried modifying configurations
(such as Fast Boot) and then updating. None of them worked.

I found that the touchpad works on Ubuntu without a flaw once Windows is
removed.

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https://bugs.launchpad.net/bugs/1490295

Title:
  Elantech touchpad not recognized

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Elantech touchpad is not recognized after installing WIndows 8.1. The touchpad works fine on the Windows. Strangely, if I reboot from Windows it works on Ubuntu as well. Then I turn off the machine, and then boot on ubuntu, then it stops working.
  i.e. if the previous boot was directed to Windows ==> The touchpad is recognized and works fine.
  if the previous boot was directed to Ubuntu ==> the touchpad is not recognized.

  I installed the driver (psmouse-elantech-x551c.tar.gz) but still the
  touchpad is not recognized.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-26-generic 3.19.0-26.28
  ProcVersionSignature: Ubuntu 3.19.0-26.28-generic 3.19.8-ckt4
  Uname: Linux 3.19.0-26-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  sun        1271 F.... pulseaudio
   /dev/snd/controlC1:  sun        1271 F.... pulseaudio
  Date: Mon Aug 31 00:41:19 2015
  HibernationDevice: RESUME=UUID=e11008f4-dd81-4ff6-b370-7a194d791ec6
  InstallationDate: Installed on 2015-05-08 (114 days ago)
  InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
  MachineType: To be filled by O.E.M To be filled by O.E.M
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-26-generic.efi.signed root=UUID=3a1601a1-9329-465d-babb-920dc6974020 ro quiet splash vt.handoff=7
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-26-generic N/A
   linux-backports-modules-3.19.0-26-generic  N/A
   linux-firmware                             1.143.3
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/28/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 4.6.5
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: To be filled by O.E.M
  dmi.board.vendor: To be filled by O.E.M
  dmi.board.version: To be filled by O.E.M.
  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.:bvr4.6.5:bd03/28/2014:svnTobefilledbyO.E.M:pnTobefilledbyO.E.M:pvrTobefilledbyO.E.M.:rvnTobefilledbyO.E.M:rnTobefilledbyO.E.M:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: To be filled by O.E.M

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