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[bd339 <bd339@xxxxxxx>]

I experienced this bug in every version of Ubuntu I have tried on this
laptop (15.10 (currently) & 15.04).

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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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