How to enable Intel_pstate in Ubuntu 15.04?
In 15.04 it's enabled by default thanks to @solsTiCe informative notes. you could check that yourself
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:
Restart your system and to check if intel_pstate is enabled, run the following command:
The command above should return "intel_pstate".