Skylake processor never reaches low power states on X1 Carbon gen 4 with NVMe drive
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Invalid
|
Medium
|
Colin Ian King |
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:/
https:/
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-
ProcVersionSign
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
CurrentDesktop: Unity
Date: Mon May 9 15:55:03 2016
HibernationDevice: RESUME=
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=
RelatedPackageV
linux-
linux-
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.
dmi.board.name: 20FBCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.
dmi.modalias: dmi:bvnLENOVO:
dmi.product.name: 20FBCTO1WW
dmi.product.
dmi.sys.vendor: LENOVO
Changed in linux (Ubuntu): | |
importance: | Undecided → Medium |
status: | Confirmed → Triaged |
tags: | added: kernel-da-key |
summary: |
- Skylake processor with NVMe drive never reaches low power package states - on X1 Carbon gen 4 + Skylake processor never reaches low power states on X1 Carbon gen 4 with + NVMe drive |
Changed in linux (Ubuntu): | |
assignee: | nobody → Colin Ian King (colin-king) |
This change was made by a bot.