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[Shih-Yuan Lee <1456881@xxxxxxxxxxxxxxxxxx>]

Because the hardware has some problem that it will miss some packs of the touchpad events randomly.
It will cause some unpredictable results, but Seth's commit just avoid some situation that will cause the abnormal behavior under the condition of comment #4.

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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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