** Changed in: sysvinit (Ubuntu Trusty)
Assignee: Tim Gardner (timg-tpi) => (unassigned)
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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:
Confirmed
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.
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https://bugs.launchpad.net/ubuntu/+source/sysvinit/+bug/1314653/+subscriptions
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