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[Launchpad Bug Tracker <1501187@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/trusty-security/linux-lts-vivid

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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:
  Triaged
Status in linux source package in Vivid:
  Fix Released

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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