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[Bug 1578840] Re: System doesn't enter low power states on Skylake processors (Lenovo Thinkpad X260)


I tried the upstream kernel you linked to, but the problem is still the


$ uname -a
Linux kaymes 4.6.0-040600rc6-generic #201605012031 SMP Mon May 2 00:33:26 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Btw, the kernel you linked to was for wily whereas this system is already xenial.

** Attachment added: "Screenshot from 2016-05-07 00-05-04.png"

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

** Tags added: kernel-bug-exists-upstream

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  System doesn't enter low power states on Skylake processors (Lenovo
  Thinkpad X260)

Status in linux package in Ubuntu:

Bug description:
  Powertop shows, that the system does not enter the low power idle
  states of the CPU (beyond PC2) despite the individual cores all
  reaching their lowest power idle states (C10). See attached screen
  shot for a typical example of powertop's output.

  A result of this is a vastly reduced battery live.

  Furthermore, Intel suggests that not enabling low power idle states may have a negative impact on the life time of the CPU. See

  The laptop is a Lenovo ThinkPad x260 which is is a Ubuntu certified
  system (http://www.ubuntu.com/certification/hardware/201511-20298/).

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-21-generic 4.4.0-21.37 [modified: boot/vmlinuz-4.4.0-21-generic]
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
   /dev/snd/controlC0:  kaymes     1572 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri May  6 07:53:35 2016
  HibernationDevice: RESUME=UUID=7b2bf86b-4ad7-48d5-ba12-ed741ffcefea
  InstallationDate: Installed on 2016-05-04 (1 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 5986:0706 Acer, Inc 
   Bus 001 Device 002: ID 8087:0a2b Intel Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 20F6CTO1WW
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
   linux-restricted-modules-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/25/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: R02ET44W (1.17 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20F6CTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrR02ET44W(1.17):bd01/25/2016:svnLENOVO:pn20F6CTO1WW:pvrThinkPadX260:rvnLENOVO:rn20F6CTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20F6CTO1WW
  dmi.product.version: ThinkPad X260
  dmi.sys.vendor: LENOVO

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