ENERGY_PERF_BIAS: Set to 'normal', was 'performance'

[Cristian Aravena Romero]

dmesg:
[ 0.022886] ENERGY_PERF_BIAS: Set to 'normal', was 'performance'
[ 0.022887] ENERGY_PERF_BIAS: View and update with x86_energy_perf_policy(8)

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: linux-image-4.11.0-10-generic 4.11.0-10.15
ProcVersionSignature: Ubuntu 4.11.0-10.15-generic 4.11.8
Uname: Linux 4.11.0-10-generic x86_64
ApportVersion: 2.20.5-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: caravena 1464 F.... pulseaudio
CurrentDesktop: GNOME
Date: Wed Jul 12 15:35:40 2017
HibernationDevice: RESUME=UUID=360bd2d2-4f44-4311-86d6-4781ac81ee87
InstallationDate: Installed on 2017-07-05 (7 days ago)
InstallationMedia: Ubuntu-GNOME 17.04 "Zesty Zapus" - Release amd64 (20170412)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U3C/530U4C
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.11.0-10-generic root=UUID=6b614287-8ce5-49c5-b66d-e92fa9568c2b ro rootflags=subvol=@ quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.11.0-10-generic N/A
 linux-backports-modules-4.11.0-10-generic N/A
 linux-firmware 1.167
SourcePackage: linux
UpgradeStatus: Upgraded to artful on 2017-07-05 (6 days ago)
dmi.bios.date: 04/15/2013
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: P14AAJ
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: SAMSUNG_NP1234567890
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: FAB1
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrP14AAJ:bd04/15/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U3C/530U4C:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
dmi.product.name: 530U3C/530U4C
dmi.product.version: 0.1
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Seth Forshee (sforshee)]

This message is normal and does not indicate a problem.

[Mikko Rantalainen (mira)]

I did not select option for "poor CPU performance" during install. I also previously disabled "ondemand" service after finding that Ubuntu 12.04 LTS had non-performance mode by default. After upgrade to Ubuntu 16.04 LTS (via Ubuntu 14.04 LTS) my CPU has been silently turned to non-performance mode.

Is there any official way to permanently say that I want performance mode so that it will not be automatically disabled in future update?

I'm okay with system defaulting to non-performance mode if the system has battery *and* is operating on battery. This system has high performance CPU with wired power connection and is able to enter sleep states (e.g. C6) to save energy when CPU is not needed. Slowing down the CPU clock is not worth the latency it causes.

[Mikko Rantalainen (mira)]

See also: https://patchwork.kernel.org/patch/8519201/