← Back to team overview

touch-packages team mailing list archive

[Bug 1314653] Re: sysvinit: default cpufreq governor to powersave for intel-pstate driver

 

Why are you not going to do this for Trusty? Many of us (well, O.K. me)
have been forcing the use of the intel_pstate driver in 14.04 and
14.04.1. Now it is my understanding that the intel_pstate driver will be
enabled by default in 14.04.2.

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to sysvinit in Ubuntu.
https://bugs.launchpad.net/bugs/1314653

Title:
  sysvinit: default cpufreq governor to powersave for intel-pstate
  driver

Status in sysvinit package in Ubuntu:
  Fix Released
Status in sysvinit source package in Trusty:
  Won't Fix
Status in sysvinit source package in Utopic:
  Fix Released

Bug description:
  When defaulting to the intel-pstate driver, there are only a couple of
  cpufreq governors available, none of which are handled in the
  /etc/init.d/ondemand script.

  Since this driver is meant to be used for power saving, it seems wrong
  to leave the system in the kernel default configured "performance"
  governor after boot, so I think it is pertinent to set this to
  "powersave" if it is the only suitable non-power hungry governor
  available.

  How to reproduce:

  1. enable the intel_pstate driver on a recent Intel machine
  (Sandybridge or above)

  edit /etc/default/grub, modify the following:

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=enable"

  and run:

  sudo update-grub

  and reboot.

  2. login

  3. wait at least 60 seconds for /etc/init.d/ondemand to complete

  check out the default cpufreq governor, you will see it is still set
  to the boot default of "performance":

  cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

  With the attached fix the system will boot into a less aggressive
  cpufreq governor.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/sysvinit/+bug/1314653/+subscriptions