i3 throttled at 500Mhz when battery under 30%

Edit a file

You can always change your clock speed by controlling Intel-pstate.

Intel-pstate can be controlled by changing files in /sys/devices/system/cpu/intel_pstate (Change as root i.e. using sudo)

Use a bash script

You can use this bash file, which I created for my own use. Note that I don't think i3 supports turbo boost.

1. Download the file from google drive

2. Run sudo chmod 775 set_cpu_pstate

3. Execute with sudo ./set_cpu_pstate

4. Set MAX power to 100

5. Set MIN power to 100 to force high performance all the time

6. Enter 1 to activate TurboBoost or 0 to deactivate it

CPU Frequency

You can use i7z for current CPU frequency.

sudo apt-get install i7z
sudo i7z