How to enable Intel_pstate in Ubuntu 15.04?
1 Answer
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".
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1At least in Ubuntu 3.19 kernel
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver
givesintel_pstate
without any boot parameters.– Pilot6May 30, 2015 at 9:09 -
cat: /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver: No such file or directory
This is my output– MaythuxMay 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– solsTiCeMay 30, 2015 at 9:15