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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1501187

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1501187

Title:
  Backport support for ACPI GPIO interrupts for i2c-hid devices

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  [Impact]

  On some platforms HID over I2C uses GPIO interrupts instead of
  directly connected to the IO-APIC. Without ACPI GPIO interrupts
  support, i2c-hid can not find IRQ when probing the device, and shows
  the following message:

  i2c_hid i2c-SYNA7508:00: Could not register for SYNA7508:00 interrupt, irq = -1, ret = -22
  i2c_hid: probe of i2c-SYNA7508:00 failed with error -22

  So far we've found this issue on some SKL platforms, and one BSW
  platform.

  [Fix]

  There's a fix in mainline v4.1-rc1, which add the support for ACPI
  GPIO interrupts for i2c-hid module.

  Commit log is as follows:

  commit a485923efbb83056b7fb79e4fd2fee05c990ad5e
  Author:     Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
  Commit:     Jiri Kosina <jkosina@xxxxxxx>
  CommitDate: Tue Feb 24 20:53:30 2015 +0100

      HID: i2c-hid: Add support for ACPI GPIO interrupts

  [Test]

  1. Boot with 4.1-rc1 kernel and patched 3.19 kernel
  2. Both touchscreen should work

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