Thank for the repor @RuiGuilherme, glad it worked

I understand the problem with brightness, that's because the script is minimal and doesn't store\use the state.
Actually I was hoping to merge the changes into Linux kernel, but some required functionalities for implementations are missing so I'm not sure to wait for them, or develop this repo.

@RuiGuilherme I've added Turbo mode support as well, can you kindly please test the updated version? (at your own risk 😆 )

Nice! Apparently works fine and the fans use the maximum speed.

Later I will check if the UnderVolt is being removed and the overclock is being applied.

Strange because this notebook should have an undervolt of -0.125v; Maybe I'm going crazy?

Using turbo mode:

# sudo intel-undervolt read
CPU (0): -0.00 mV
GPU (1): -0.00 mV
CPU Cache (2): -0.00 mV
System Agent (3): -0.00 mV
Analog I/O (4): -0.00 mV

Normal mode:

# sudo intel-undervolt read
CPU (0): -0.00 mV
GPU (1): -0.00 mV
CPU Cache (2): -0.00 mV
System Agent (3): -0.00 mV
Analog I/O (4): -0.00 mV

This application may not read my CPU status correctly as it hasn't been updated in two years: intel-undervolt

Probably because it hasn't received the update. I think our CPU was build after the last commit of that repository.
btw I think turbo for helios 300 works only on GPU (not sure)

Hup! You are right. Just overclock GPU, but at the time I bought this notebook it came with Windows, and it had an undervolt on the i7 9750H and Turbo Mode "Disable" this undervolt.

I don't remember the exact values because I bought this notebook in 2020, but I had used this thead to reverse the undervolt without using turbo mode.
https://www.techpowerup.com/forums/threads/undervolt-an-i7-9750h-with-throttlestop.268380/

But it's like I said, maybe I'm going crazy haha

Edit:
I'm going to use a Windows To-Go to see this issue and confirm it.