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.

You received this bug notification because you are a member of Kernel
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  ENERGY_PERF_BIAS: Set to 'normal', was 'performance'

Status in linux package in Ubuntu:

Bug description:
  [    0.022886] ENERGY_PERF_BIAS: Set to 'normal', was 'performance'
  [    0.022887] ENERGY_PERF_BIAS: View and update with 

  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
   /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
   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.product.name: 530U3C/530U4C
  dmi.product.version: 0.1
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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