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This bug was fixed in the package linux - 3.19.0-32.37

---------------
linux (3.19.0-32.37) vivid; urgency=low

  [ Luis Henriques ]

  * Release Tracking Bug
    - LP: #1508381

  [ Joseph Salisbury ]

  * SAUCE: storvsc: use small sg_tablesize on x86
    - LP: #1495983

  [ Phidias Chiang ]

  * SAUCE: dma: dw_dmac: Workaround for stop probing on HP X360 laptop v2
    - LP: #1501580

  [ Tim Gardner ]

  * [Config] Add MMC modules sufficient for net booting
    - LP: #1502772

  [ Upstream Kernel Changes ]

  * USB: whiteheat: fix potential null-deref at probe
    - LP: #1478826
    - CVE-2015-5257
  * dcache: Handle escaped paths in prepend_path
    - LP: #1441108
    - CVE-2015-2925
  * vfs: Test for and handle paths that are unreachable from their mnt_root
    - LP: #1441108
    - CVE-2015-2925
  * hv_netvsc: Add support to set MTU reservation from guest side
    - LP: #1494431
  * hv_netvsc: Add close of RNDIS filter into change mtu call
    - LP: #1494431
  * powerpc/eeh: Fix missed PE#0 on P7IOC
    - LP: #1502982
  * powerpc/powernv: display reason for Malfunction Alert HMI.
    - LP: #1482343
  * powerpc/powernv: Pull all HMI events before panic.
    - LP: #1482343
  * powerpc/powernv: Invoke opal_cec_reboot2() on unrecoverable machine
    check errors.
    - LP: #1482343
  * powerpc/powernv: Invoke opal_cec_reboot2() on unrecoverable HMI.
    - LP: #1482343
  * powerpc/eeh: Fix PE#0 check in eeh_add_to_parent_pe()
    - LP: #1502982
  * HID: i2c-hid: The interrupt should be level sensitive v2
    - LP: #1501187
  * HID: i2c-hid: Add support for ACPI GPIO interrupts v2
    - LP: #1501187

 -- Luis Henriques <luis.henriques@xxxxxxxxxxxxx>  Wed, 21 Oct 2015
10:30:13 +0100

** Changed in: linux (Ubuntu Vivid)
       Status: Fix Committed => Fix Released

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2015-2925

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2015-5257

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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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