Public bug reported: 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 ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug xenial ** Attachment added: "Powertop screenshot" https://bugs.launchpad.net/bugs/1578840/+attachment/4656673/+files/Screenshot%20from%202016-05-06%2007-50-49.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1578840 Title: System doesn't enter low power states on Skylake processors (Lenovo Thinkpad X260) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1578840/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
