Limited Hotkey function support due to there are no enough function keys between
F1 and F12 on keyboard.
Platform designer can re-design keyboard layout to provide more hotkey space, but
it causes cost up.
Embedded controller (EC) has capability to identify the behavior when brightness
hotkey is pressed or hold down within a debounce time.
When brightness hotkey is pressed and then release within a debounce time, this
hotkey event is set as brightness up.
When brightness hotkey is kept press within a debounce time, this hotkey event is
set as brightness down.
Depend on the brightness hotkey pressed behavior that identified by EC, EC can
issue scan code, SMI or ACPI Query event to BIOS to issue brightness event to
Note: This brightness hotkey debounce time can be set up in BIOS setup menu.
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INC, HP, "USING SINGLE HOTKEY TO CONTROL BRIGHTNESS ON NOTEBOOK", Technical Disclosure Commons, (September 16, 2019)