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Message #62418
[Bug 1314653] Re: sysvinit: default cpufreq governor to powersave for intel-pstate driver
Hello Colin, or anyone else affected,
Accepted sysvinit into trusty-proposed. The package will build now and
be available at https://launchpad.net/ubuntu/+source/sysvinit/2.88dsf-
41ubuntu6.1 in a few hours, and then in the -proposed repository.
Please help us by testing this new package. See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed. Your feedback will aid us getting this update
out to other Ubuntu users.
If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed. In either case, details of your testing will help
us make a better decision.
Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in
advance!
** Changed in: sysvinit (Ubuntu Trusty)
Status: Confirmed => Fix Committed
** Tags added: verification-needed
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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:
Fix Committed
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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