An idea comes from: https://github.com/tpurtell/PWM
This one though is a command-line utility, which allows you changing frequency on Windows startup

This utility allows you to adjust LCD panel backlight PWM driver frequency, controlled by Intel Graphics embedded GPU

Changing PWM freuquency may affect lifetime of lamp in your screen. You might end up looking into abyss. You have been WARNED!

Latest (pre)release version can be found here: https://github.com/anatoliis/PWMHelper/releases/download/v0.1/PWMHelper.exe

As simple as running:

• PWMHelper.exe 2000 - set the PWM frequency to 2000Hz
• PWMHelper.exe - display your current frequency

Windows x64 / Intel embedded GPU's only

Public domain