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Message #177819
[Bug 1579917] Re: Skylake processor never reaches low power states on X1 Carbon gen 4 with NVMe drive
Here's a screen cap of powertop. Notice that the package never reaches
any powerstate above pc2.
** Attachment added: "powertop.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1579917/+attachment/4660278/+files/powertop.txt
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https://bugs.launchpad.net/bugs/1579917
Title:
Skylake processor never reaches low power states on X1 Carbon gen 4
with NVMe drive
Status in linux package in Ubuntu:
Triaged
Bug description:
Reproducer
1. Find a skylake machine. - in my case Lenovo x1 carbon gen 4. In my case with an NVME drive.
2. run powertop, and switch to idle stats tab
3. do nothing. *(as in let the machine idle till the cores regularly reach low power states.
4. Watch the watts fly. On my machine the package never gets into any power state other than PC2.
Expected results: PC3-PC10 power states should all show some usage.
I also tried the mainline build of 4.6-rc7 with no benefits.
Public conversations about the issue
https://mjg59.dreamwidth.org/42156.html
https://mjg59.dreamwidth.org/41713.html
As far as I can tell having the nvme drive is part of the overall
problem here. Please keep this case to skylake + nvme. Skylake +
sata appears to have a number of fixes in the 4.6 and newer kernels
that enable some of the higher sleep states, but I have not tested
with a sata drive. Those fixes as of testing 4.6-rc7 do not resolve
this issue with users who have nvme drives.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-22-generic 4.4.0-22.39
ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: chiluk 3139 F.... pulseaudio
CurrentDesktop: Unity
Date: Mon May 9 15:55:03 2016
HibernationDevice: RESUME=UUID=4f4ea88e-642e-4be5-bdf0-bbc7f47f5628
InstallationDate: Installed on 2016-04-25 (14 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 04f2:b531 Chicony Electronics Co., Ltd
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: LENOVO 20FBCTO1WW
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic.efi.signed root=UUID=249f91bb-7789-41cc-9cc0-8ba25d7f55bb ro quiet splash pcie_aspm=force vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.4.0-22-generic N/A
linux-backports-modules-4.4.0-22-generic N/A
linux-firmware 1.157
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/15/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: N1FET37W (1.11 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20FBCTO1WW
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:bvrN1FET37W(1.11):bd03/15/2016:svnLENOVO:pn20FBCTO1WW:pvrThinkPadX1Carbon4th:rvnLENOVO:rn20FBCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20FBCTO1WW
dmi.product.version: ThinkPad X1 Carbon 4th
dmi.sys.vendor: LENOVO
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References