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[Shih-Yuan Lee <1456881@xxxxxxxxxxxxxxxxxx>]

The touchpad of Dell XPS 13 (2015) in I2C mode never works with trusty 3.13 kernel.
However the touchpad of Dell XPS 13 (2015) in PS/2 mode does work with trusty 3.13 kernel by default.
I need to use osi_acpi="Windows 2013" to make it function in I2C mode with trusty 3.13 kernel.

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https://bugs.launchpad.net/bugs/1456881

Title:
  Some touchpads' right button doesn't work under I2C mode, need support
  of clickpads

Status in HWE Next Project:
  In Progress
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Trusty:
  Fix Committed
Status in linux source package in Utopic:
  Fix Committed

Bug description:
  We need to add this support, otherwise some touchpads' right button
  doesn't work under I2C mode.

  commit	015fdaa9f8edd89a456b3331088e1b77ebdad9d0 (patch)
  HID: multitouch: add support of clickpads
  Touchpads that have only one button are called clickpads and should
  be advertised as such by the kernel.

  Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
  Tested-by: Jason Ekstrand <jason@xxxxxxxxxxxxxx>
  Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>

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