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[Bug 1561974] Re: [Lenovo T460s] freeze on battery + lid close


See also 
https://bugzilla.kernel.org/show_bug.cgi?id=110941 (in particular comment #104)
and the patch in the ACPI maintainer's tree linked in that comment

I'm trying out the patch vs 4.4.0-16 (on Xenial) and 4.4.0-14 (on
Trusty) on a couple of T460s machines using

apt-get source linux-image-4.4.0-16-generic && cd linux-4.4.0 && patch
-p1 < ../../t460-smm-pstates.patch && dpkg-buildpackage

I'm not sure this is the right approach, but the advice at
https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel didn't work for me (is
it out of date?) I built and installed with the patch OK (i.e. no hang
on lid close) on Trusty using make deb-pkg CONFIG_LOCALVERSION=-blah but
K/BYOK advises against it.

** Bug watch added: Linux Kernel Bug Tracker #110941

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  [Lenovo T460s] freeze on battery + lid close

Status in linux package in Ubuntu:
Status in linux source package in Xenial:

Bug description:
  The laptop freezes when on battery power and the lid is closed.

  Relevant bug: https://bugzilla.kernel.org/show_bug.cgi?id=113551

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-15-generic 4.4.0-15.31
  ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6
  Uname: Linux 4.4.0-15-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
   /dev/snd/pcmC0D0p:   luki       1021 F...m pulseaudio
   /dev/snd/controlC0:  luki       1021 F.... pulseaudio
  CurrentDesktop: X-Cinnamon
  Date: Fri Mar 25 13:46:30 2016
  InstallationDate: Installed on 2016-03-09 (15 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160307)
  MachineType: LENOVO 20FAA01200
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-15-generic root=UUID=9137cae3-ceaa-4c5f-a4bd-4e0473140061 ro quiet splash vt.handoff=7
   linux-restricted-modules-4.4.0-15-generic N/A
   linux-backports-modules-4.4.0-15-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/15/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N1CET37W (1.05 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20FAA01200
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrN1CET37W(1.05):bd01/15/2016:svnLENOVO:pn20FAA01200:pvrThinkPadT460s:rvnLENOVO:rn20FAA01200:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20FAA01200
  dmi.product.version: ThinkPad T460s
  dmi.sys.vendor: LENOVO

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