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

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https://bugs.launchpad.net/bugs/1562778

Title:
  I2C touchscreen init failed on HP X360

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Vivid:
  Fix Committed
Status in linux source package in Wily:
  In Progress
Status in linux source package in Xenial:
  Fix Released

Bug description:
  [Impact]

  As title, after upgrading to latest Vivid kernel the touchscreen
  failed. After bisecting shows this revert cause the regression:

  commit 95df597989f6f297db63dd8669656d10f5f48eb1
  Author: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
  Date: Fri Dec 4 23:49:18 2015 +0200

      Revert "ACPI / LPSS: allow to use specific PM domain during
  ->probe()"

  [Fix]

  The reverted patch has had a revised version upstreamed:

  commit de16d55206c5ce82ad44590b01718fbe2323853c
  Author: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
  Date:   Fri Dec 4 23:49:19 2015 +0200

      ACPI / LPSS: allow to use specific PM domain during ->probe()

  For Vivid it depends on a patch to device core for adding
  BUS_NOTIFY_DRIVER_NOT_BOUND notification, both are clean cherry-pick.

  For Xenial the touchscreen still works because the original patch is
  not reverted, and with the patch reverted the I2C touchscreen still
  works fine, so I'll skip Xenial for this patch.

  For Wily it also contains the revert patch as Vivid, but the I2C on
  X360 still works.

  [Test]

  3.19.0-56 -> Failed
  3.19.0-56 + patches -> OK (Including suspend)
  4.2.0-34 (with revert patch already) -> OK
  4.4.0-15 -> OK
  4.4.0-15 + revert patch -> OK
  4.4.0-15 + patches -> N/A

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