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

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