Trying to follow this answer under Disabling Intel Turbo Boost in ubuntu:
In order to see the driver:
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver intel_pstate intel_pstate intel_pstate intel_pstate
Then, to inquire as to the turbo enabled or disabled status:
cat /sys/devices/system/cpu/intel_pstate/no_turbo 1
That means it's on.
To disable it, I get "Operation not permitted":
echo "0" | sudo tee /sys/devices/system/cpu/intel_pstate/no_turbo [sudo] password for cipeos: 0 tee: /sys/devices/system/cpu/intel_pstate/no_turbo: Operation not permitted
Trying a suggestion in a comment under the answer (
sudo echo "0" | sudo tee /sys/devices/system/cpu/intel_pstate/no_turbo) I get the same thing. Even
sudo su before that gives the same.
Trying to find manually the file:
sudo gedit /sys/devices/system/cpu/intel_pstate/no_turbo
It has just one line:
When I try to change it to 0 and save it it says: "Could not save the file “/sys/devices/system/cpu/intel_pstate/no_turbo”." and "You do not have the permissions necessary to save the file. Please check that you typed the location correctly and try again."
The turbo enabled or disabled flag can be misleading. Excerpt from
Documentation/cpu-freq/intel-pstate.txtin the source tree:
So, in this case the "1" means turbo is disabled. For most computers, turbo can be disabled in the BIOS, in which case one can not override the indicator flag in Sysfs. Example 1 (turbo is disabled in the BIOS):
Example 2 (turbo is enabled in the BIOS):