Enable intel p_state Ubuntu 15.04

Question

How to enable Intel_pstate in Ubuntu 15.04?

Maythux · Accepted Answer · 2015-05-30 10:48:57Z

4

In 15.04 it's enabled by default thanks to @solsTiCe informative notes. you could check that yourself

if grep -i pstate /boot/config-$(uname -r) says yes then it's so.

To enable intel_pstate in Ubuntu 14.04 , edit the /etc/default/grub configuration file with a text editor as root

gksu gedit /etc/default/grub

And for "GRUB_CMDLINE_LINUX_DEFAULT=" , add "intel_pstate=enable", like this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=enable"

Save the file and update Grub:

sudo update-grub

Restart your system and to check if intel_pstate is enabled, run the following command:

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

The command above should return "intel_pstate".

answered May 30, 2015 at 9:01

Maythux

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1

There is no need to set boot parameters. It is enabled by default.
– Pilot6
May 30, 2015 at 9:06
intel_pstate=enable is enabled by default?
– Maythux
May 30, 2015 at 9:08
1

At least in Ubuntu 3.19 kernel cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver gives intel_pstate without any boot parameters.
– Pilot6
May 30, 2015 at 9:09
cat: /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver: No such file or directory This is my output
– Maythux
May 30, 2015 at 9:10
1

"Starting with kernel 3.9, the new pstate power scaling driver is used automatically for modern Intel CPUs instead of the other drivers below." Source: Arch wiki
– solsTiCe
May 30, 2015 at 9:15

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