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[Launchpad Bug Tracker <1483467@xxxxxxxxxxxxxxxxxx>]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: linux-lts-utopic (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1483467

Title:
  [Acer Aspire V5-573G] suspend/resume failure

Status in linux-lts-utopic package in Ubuntu:
  Confirmed

Bug description:
  It looks to be a duplicate of
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1416557 bug
  (which was closed because it has expired).

  I made kernel bisection (log attached) as was requested in bug 1416557 and found
  # first bad commit: [faae404ebdc6bba744919d82e64c16448eb24a36] ACPICA: Add "Windows 2013" string to _OSI support.

  It appears that resume fails because ACPI OSI reports OS to be "Windows 2013".
  I added boot kernel parameter acpi_osi="!Windows 2013" and now able to suspend-resume normally (checked in kernels up to 3.16)

  I have no idea whar ACPI OSI means and why  "Windows 2013" prevents
  from normal resume (the problem seems to happen somwhere in nouveau
  driver). I just spend 3 days for this bisection and want others ubuntu
  users have this problem  fixed.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-45-generic 3.16.0-45.60~14.04.1
  ProcVersionSignature: Ubuntu 3.16.0-45.60~14.04.1-generic 3.16.7-ckt14
  Uname: Linux 3.16.0-45-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Aug 11 04:48:58 2015
  InstallationDate: Installed on 2015-08-09 (1 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  SourcePackage: linux-lts-utopic
  UpgradeStatus: No upgrade log present (probably fresh install)

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