18 Area-51 AA18250, 300 Hz not working

The refresh rate stays at 144 Hz when switching from the Hybrid Graphic mode to the Discrete Graphics mode in the BIOS by disabling Hybrid Graphics or Advanced Optimus.

Mistakenly, Windows retains the last setting used supporting 144 Hz in hybrid graphic mode with the Intel driver and thus retains 144 Hz when switched to Discrete Graphics mode from the BIOS.

To resolve this behavior, you will need to manually change from 144 Hz to 300 Hz =