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[bd339 <bd339@xxxxxxx>]

By using:
"xinput list-props 13"
where 13 is the id of the touchpad as retrieved by "xinput list",
I have discovered that the faulty mechanism does not affect the "Device Enabled" xinput propety, but the working mechanism in "Mouse and Touchpad settings" (the toggle button) does indeed toggle the "Device Enabled" xinput propety.

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https://bugs.launchpad.net/bugs/1518737

Title:
  can not re-enable touchpad

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I am running Ubuntu 15.10 (32-bit edition but I know it is also a problem on 64-bit edition) on an Acer Aspire 5738 laptop which has a physical button next to the touchpad that can toggle the device.
  When I hit the button a desktop notification appears, informing me that the device has been disabled (an icon of a touchpad with an x in the bottom-right-hand-corner) and I am no longer able to use the touchpad for anything, as expected.
  When I press the button again to re-enable the touchpad, a desktop notification appears, informing me that the device has been enabled (an icon of a touchpad with no x in the bottom-right-hand-corner) but the touchpad remains disabled, i.e I can use it for absolutely nothing. (clicking, scrolling, pointing, ...)
  Re-logging or restarting the laptop enables the touchpad, but I can also use modprobe to remove and insert psmouse module, which will also cause it to enable.
  When I use the button physically next to the touchpad to enable/disable the touchpad, it does not affect the toggle switch in the "Mouse and Touchpad" settings, but if I use that setting (the toggle switch) I can correctly enable and disable the touchpad.
  xinput lists the device under "Virtual core pointer" as an "AlpsPS/2 ALPS GlidePoint".
  BIOS is updated as of today.
  If I can be of help in patching the bug, I would love to, but I just have no idea where to look. I altered the psmouse kernel module to print information to the logs about various activity (resetting, deactivating) but none of it was very informative (again, I don't know where to look).
  ---
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  benjamin   1617 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 15.10
  HibernationDevice: RESUME=UUID=7b71d0e9-05b0-4b07-9cd1-e4a998e8be54
  InstallationDate: Installed on 2015-11-23 (0 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: Acer Aspire 5738
  Package: linux (not installed)
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic root=UUID=c2650be5-50b4-4182-a8e7-c428326ae23e ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-18-generic N/A
   linux-backports-modules-4.2.0-18-generic  N/A
   linux-firmware                            1.149.2
  Tags:  wily
  UdevLog: Error: [Errno 2] Ingen sådan fil eller filkatalog: '/var/log/udev'
  Uname: Linux 4.2.0-18-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 09/24/2010
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: V1.34
  dmi.board.name: JV50_MV
  dmi.board.vendor: Acer
  dmi.board.version: Rev
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrV1.34:bd09/24/2010:svnAcer:pnAspire5738:pvr0100:rvnAcer:rnJV50_MV:rvrRev:cvnAcer:ct10:cvrN/A:
  dmi.product.name: Aspire 5738
  dmi.product.version: 0100
  dmi.sys.vendor: Acer

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