[Bug 1155296] Re: Touchpad toggle no longer functions on Lenovo devices

[Brandon Gilmore]

This update positively broke X220 and X1 Carbon users.

% xinput list
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ SynPS/2 Synaptics TouchPad                id=14   [slave  pointer  (2)]
⎜   ↳ TPPS/2 IBM TrackPoint                     id=16   [slave  pointer  (2)]
...

I don't have a T420s on hand to compare xinput output.

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https://bugs.launchpad.net/bugs/1155296

Title:
  Touchpad toggle no longer functions on Lenovo devices

Status in “acpi-support” package in Ubuntu:
  Incomplete

Bug description:
  Recently pushed to Precise:

  acpi-support (0.140.1) precise-proposed; urgency=low

    * asus-touchpad.sh: Don't handle Synaptics devices. (LP: #804109)

   -- Timo Aaltonen <tjaalton at ubuntu.com>  Tue, 09 Oct 2012 13:35:58
  +0300

  
  User reports:

  If you check /etc/acpi/events/lenovo-touchpad, it responds to the ACPI
  event of the Fn+F8 key by calling the script /etc/acpi/thinkpad-
  stretchortouchpad.sh, which in turns call /etc/acpi/asus-touchpad.sh,
  which is the file changed in this last update.

  In this new version, /etc/acpi/asus-touchpad.sh tests the output of
  'xinput list' against the string "PS/2 Elantech Touchpad", which
  doesn't match the actual device which is "SynPS/2 Synaptics TouchPad".

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