Keep in mind this system BIOS has a "Brightness Mode Control" set to "Auto" under the "Boot" menu. Setting it to "User Control" makes the FN+UP/DOWN keys work at boot time.
Keep in mind this system BIOS has a "Brightness Mode Control" set to "Auto" under the "Boot" menu. Setting it to "User Control" makes the FN+UP/DOWN keys work at boot time.