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
https://mjg59.dreamwidth.org/41713.html
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
AudioDevicesInUse:
USER PID ACCESS COMMAND
/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)
Lsusb:
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
RelatedPackageVersions:
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
This change was made by a bot.