sysvinit: default cpufreq governor to powersave for intel-pstate driver
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
sysvinit (Ubuntu) |
Fix Released
|
High
|
Tim Gardner | ||
Trusty |
Fix Released
|
High
|
Stefan Bader | ||
Utopic |
Fix Released
|
High
|
Tim Gardner |
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.
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_
and run:
sudo update-grub
and reboot.
2. login
3. wait at least 60 seconds for /etc/init.
check out the default cpufreq governor, you will see it is still set to the boot default of "performance":
cat /sys/devices/
With the attached fix the system will boot into a less aggressive cpufreq governor.
Changed in sysvinit (Ubuntu): | |
importance: | Undecided → High |
Changed in sysvinit (Ubuntu Utopic): | |
assignee: | nobody → Tim Gardner (timg-tpi) |
status: | New → In Progress |
Changed in sysvinit (Ubuntu Trusty): | |
assignee: | nobody → Tim Gardner (timg-tpi) |
status: | New → In Progress |
tags: | added: 14.04.2 hwe |
Changed in sysvinit (Ubuntu Trusty): | |
assignee: | Tim Gardner (timg-tpi) → nobody |
Changed in sysvinit (Ubuntu Trusty): | |
assignee: | nobody → Stefan Bader (smb) |
tags: |
added: trusty removed: 14.04.2 hwe |
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