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

WHAT'S THIS?

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

WARNING: USE AT YOUR OWN RISK

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

DOWNLOAD

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

USING

As simple as running:

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

Compatibility

Windows x64 / Intel embedded GPU's only

LICENSE

Public domain