Also related?
https://bugzilla.kernel.org/show_bug.cgi?id=90421
https://askubuntu.com/questions/582805/high-cpu-frequency-at-idle
Workaround from that bug: Force low power state:
shevek@raven:/sys/devices/system/cpu/intel_pstate$ cpupower frequency-info
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 0.97 ms.
hardware limits: 500 MHz - 3.20 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 500 MHz and 2.80 GHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 3.19 GHz.
boost state support:
Supported: yes
Active: yes
shevek@raven:/sys/devices/system/cpu/intel_pstate$ sudo cpupower frequency-set
-g powersave
Setting cpu: 0
Setting cpu: 1
Setting cpu: 2
Setting cpu: 3
shevek@raven:/sys/devices/system/cpu/intel_pstate$ cpupower frequency-info
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 0.97 ms.
hardware limits: 500 MHz - 3.20 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 500 MHz and 2.80 GHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 1.20 GHz.
boost state support:
Supported: yes
Active: yes
shevek@raven:/sys/devices/system/cpu/intel_pstate$ grep MHz /proc/cpuinfo
cpu MHz : 1300.000
cpu MHz : 1405.726
cpu MHz : 1200.062
cpu MHz : 1229.617
Now it's scaled down again.
** Bug watch added: Linux Kernel Bug Tracker #90421
http://bugzilla.kernel.org/show_bug.cgi?id=90421
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1535426
Title:
CPU runs at high speed after upgrade
Status in linux package in Ubuntu:
Confirmed
Bug description:
After a dist-upgrade from 15.04 to 15.10, moving from kernel 3.19.0-43
to 4.2.0-23, my laptop CPU runs continuously at 3GHz, and never slows
down to 800MHz, as it used to. This has reduced my battery life from
24 hours to 8 hours.
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-4.2.0-23-generic 4.2.0-23.28
ProcVersionSignature: Ubuntu 4.2.0-23.28-generic 4.2.6
Uname: Linux 4.2.0-23-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: shevek 2664 F.... pulseaudio
/dev/snd/controlC0: shevek 2664 F.... pulseaudio
CurrentDesktop: XFCE
Date: Mon Jan 18 11:38:29 2016
HibernationDevice: RESUME=UUID=22fd2208-7557-432d-bbff-95dd97905323
InstallationDate: Installed on 2015-05-18 (244 days ago)
InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
MachineType: LENOVO 20CKCT01WW
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-23-generic.efi.signed
root=/dev/mapper/xubuntu--vg-root ro noprompt persistent quiet splash
vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.2.0-23-generic N/A
linux-backports-modules-4.2.0-23-generic N/A
linux-firmware 1.149.3
SourcePackage: linux
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: Upgraded to wily on 2016-01-17 (1 days ago)
dmi.bios.date: 08/20/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: N11ET34W (1.10 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20CKCT01WW
dmi.board.vendor: LENOVO
dmi.board.version: 0B98417 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias:
dmi:bvnLENOVO:bvrN11ET34W(1.10):bd08/20/2015:svnLENOVO:pn20CKCT01WW:pvrThinkPadT550:rvnLENOVO:rn20CKCT01WW:rvr0B98417WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20CKCT01WW
dmi.product.version: ThinkPad T550
dmi.sys.vendor: LENOVO
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