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[barnabear <barnabear2@xxxxxxxxx>]

The hardware works fine under Windows 10 (bleurgh).

I had a look through /var/log/Xorg.0.log and found these lines

[     9.901] (II) config/udev: Adding input device ETPS/2 Elantech Touchpad (/dev/input/event6)
[     9.901] (**) ETPS/2 Elantech Touchpad: Applying InputClass "evdev touchpad catchall"
[     9.901] (**) ETPS/2 Elantech Touchpad: Applying InputClass "touchpad catchall"
[     9.901] (**) ETPS/2 Elantech Touchpad: Applying InputClass "Default clickpad buttons"
[     9.901] (II) LoadModule: "synaptics"
[     9.901] (II) Loading /usr/lib/xorg/modules/input/synaptics_drv.so
[     9.901] (II) Module synaptics: vendor="X.Org Foundation"
[     9.901] 	compiled for 1.17.1, module version = 1.8.2
[     9.901] 	Module class: X.Org XInput Driver
[     9.901] 	ABI class: X.Org XInput driver, version 21.0
[     9.901] (II) Using input driver 'synaptics' for 'ETPS/2 Elantech Touchpad'
[     9.901] (**) ETPS/2 Elantech Touchpad: always reports core events
[     9.902] (**) Option "Device" "/dev/input/event6"
[     9.972] (II) synaptics: ETPS/2 Elantech Touchpad: found clickpad property
[     9.972] (--) synaptics: ETPS/2 Elantech Touchpad: x-axis range 0 - 3097 (res 31)
[     9.972] (--) synaptics: ETPS/2 Elantech Touchpad: y-axis range 0 - 2119 (res 32)
[     9.972] (--) synaptics: ETPS/2 Elantech Touchpad: pressure range 0 - 255
[     9.972] (--) synaptics: ETPS/2 Elantech Touchpad: finger width range 0 - 15
[     9.972] (--) synaptics: ETPS/2 Elantech Touchpad: buttons: left double triple
[     9.972] (--) synaptics: ETPS/2 Elantech Touchpad: Vendor 0x2 Product 0xe
[     9.972] (**) Option "SoftButtonAreas" "50% 0 82% 0 0 0 0 0"
[     9.972] (--) synaptics: ETPS/2 Elantech Touchpad: touchpad found
[     9.972] (**) ETPS/2 Elantech Touchpad: always reports core events
[    10.016] (**) Option "config_info" "udev:/sys/devices/platform/i8042/serio4/input/input12/event6"
[    10.016] (II) XINPUT: Adding extended input device "ETPS/2 Elantech Touchpad" (type: TOUCHPAD, id 12)
[    10.016] (**) synaptics: ETPS/2 Elantech Touchpad: (accel) MinSpeed is now constant deceleration 2.5
[    10.016] (**) synaptics: ETPS/2 Elantech Touchpad: (accel) MaxSpeed is now 1.75
[    10.016] (**) synaptics: ETPS/2 Elantech Touchpad: (accel) AccelFactor is now 0.053
[    10.016] (**) ETPS/2 Elantech Touchpad: (accel) keeping acceleration scheme 1
[    10.016] (**) ETPS/2 Elantech Touchpad: (accel) acceleration profile 1
[    10.016] (**) ETPS/2 Elantech Touchpad: (accel) acceleration factor: 2.000
[    10.016] (**) ETPS/2 Elantech Touchpad: (accel) acceleration threshold: 4
[    10.016] (--) synaptics: ETPS/2 Elantech Touchpad: touchpad found
[    10.017] (II) config/udev: Adding input device ETPS/2 Elantech Touchpad (/dev/input/mouse1)
[    10.017] (**) ETPS/2 Elantech Touchpad: Ignoring device from InputClass "touchpad ignore duplicates"

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https://bugs.launchpad.net/bugs/1548127

Title:
  Touchpad no longer working on Asus Zenbook UX305FA

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I have Ubuntu 15.10 installed, and all was working fine. Then I
  accepted some software updates and my mouse pointer no longer appears.
  If I plug in an external USB mouse then all is fine, but I want to use
  the touchpad - it was working, doesn't now.

  cat /proc/bus/input/devices gives me output that includes ...

  I: Bus=0011 Vendor=0002 Product=000e Version=0000
  N: Name="ETPS/2 Elantech Touchpad"
  P: Phys=isa0060/serio4/input0
  S: Sysfs=/devices/platform/i8042/serio4/input/input12
  U: Uniq=
  H: Handlers=mouse0 event5 
  B: PROP=5
  B: EV=b
  B: KEY=e420 10000 0 0 0 0
  B: ABS=661800011000003

  I did find a couple of bug reports for the UX305CA and tried
  installing the following debs downloaded from
  http://www.godisbeautiful.net/4.4rc8deb/, but it didn't fix the
  problem

  linux-firmware-image-4.4.0-rc8-touchpad_4.4.0-rc8-touchpad-1_amd64.deb
  linux-headers-4.4.0-rc8-touchpad_4.4.0-rc8-touchpad-1_amd64.deb
  linux-image-4.4.0-rc8-touchpad_4.4.0-rc8-touchpad-1_amd64.deb
  linux-image-4.4.0-rc8-touchpad-dbg_4.4.0-rc8-touchpad-1_amd64.deb
  linux-libc-dev_4.4.0-rc8-touchpad-1_amd64.deb

  Booting the previous versions of the kernel didn't help. I also tried
  editing /etc/default/grub to change this line ...

  GRUB_CMDLINE_LINUX_DEFAULT="i8042.reset quiet splash"

  ... and then ran update-grub and reboot, but it didn't make any
  difference.

  Help?

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-29-generic 4.2.0-29.34
  ProcVersionSignature: Ubuntu 4.2.0-29.34-generic 4.2.8-ckt3
  Uname: Linux 4.2.0-29-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  leigh      1750 F.... pulseaudio
   /dev/snd/controlC0:  leigh      1750 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Feb 21 22:25:26 2016
  InstallationDate: Installed on 2015-03-20 (338 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 064e:9700 Suyin Corp. Asus Integrated Webcam
   Bus 001 Device 002: ID 8087:0a2a Intel Corp. 
   Bus 001 Device 004: ID 046d:c058 Logitech, Inc. M115 Mouse
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: ASUSTeK COMPUTER INC. UX305FA
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-29-generic.efi.signed root=UUID=ee079f66-30dc-483b-bbd4-b6c4fb7578d4 ro i8042.reset quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-29-generic N/A
   linux-backports-modules-4.2.0-29-generic  N/A
   linux-firmware                            1.149.3
  SourcePackage: linux
  UpgradeStatus: Upgraded to wily on 2015-11-26 (86 days ago)
  dmi.bios.date: 11/20/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: UX305FA.204
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: UX305FA
  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.:bvrUX305FA.204:bd11/20/2014:svnASUSTeKCOMPUTERINC.:pnUX305FA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX305FA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: UX305FA
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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