Kai-Heng Feng, I also noticed that by default the scaling driver used is
acpi-cpufreq and not p-state. I've read that p-state is favorable for
kernels >= 4.4. Is this something that is up to the user to decide or
should this be considered an incorrect default?
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 10.0 us.
hardware limits: 800 MHz - 2.80 GHz
available frequency steps: 2.80 GHz, 2.80 GHz, 2.70 GHz, 2.60 GHz, 2.40 GHz,
2.30 GHz, 2.00 GHz, 1.90 GHz, 1.80 GHz, 1.70 GHz, 1.50 GHz, 1.40 GHz, 1.20 GHz,
1.10 GHz, 900 MHz, 800 MHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 800 MHz and 2.80 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 900 MHz (asserted by call to hardware).
cpufreq stats: 2.80 GHz:2.85%, 2.80 GHz:0.00%, 2.70 GHz:0.25%, 2.60
GHz:0.64%, 2.40 GHz:0.65%, 2.30 GHz:1.42%, 2.00 GHz:2.07%, 1.90 GHz:1.27%, 1.80
GHz:1.64%, 1.70 GHz:3.14%, 1.50 GHz:3.57%, 1.40 GHz:5.39%, 1.20 GHz:6.85%, 1.10
GHz:13.39%, 900 MHz:29.31%, 800 MHz:27.53% (2074191)
boost state support:
Supported: yes
Active: yes
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1672439
Title:
No C-State Deeper than C3 utilized by Kaby Lake 7820HQ in Precision
5520
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Xenial:
In Progress
Bug description:
My processor does not appear to be utilizing and idling states deeper
than C3.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-66-generic 4.4.0-66.87
ProcVersionSignature: Ubuntu 4.4.0-66.87-generic 4.4.44
Uname: Linux 4.4.0-66-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: carl 2446 F.... pulseaudio
CurrentDesktop: Unity
Date: Mon Mar 13 08:57:06 2017
DistributionChannelDescriptor:
# This is a distribution channel descriptor
# For more information see
http://wiki.ubuntu.com/DistributionChannelDescriptor
canonical-oem-somerville-xenial-amd64-20160624-2
HibernationDevice: RESUME=UUID=65474558-ead3-4d66-85e5-b55f81978b88
InstallationDate: Installed on 2017-03-09 (3 days ago)
InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary
20160624-10:47
IwConfig:
lo no wireless extensions.
wlp2s0 no wireless extensions.
MachineType: Dell Inc. Precision 5520
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-66-generic.efi.signed
root=UUID=d19efcb8-515b-494c-a236-ee0da23f2393 ro acpi_rev_override locale=C
quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.4.0-66-generic N/A
linux-backports-modules-4.4.0-66-generic N/A
linux-firmware 1.157.8
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/18/2017
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.1.3
dmi.board.name: 0X41RR
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.1.3:bd01/18/2017:svnDellInc.:pnPrecision5520:pvr:rvnDellInc.:rn0X41RR:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.name: Precision 5520
dmi.sys.vendor: Dell Inc.
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