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Chapter 2 47
Power Button
The Power button should act as the ACPI defined Power button and users can determine its policy through the OS
setting like Windows Power Options.
The override feature should be supported to allow the unconditional shutdown by pressing the Power button for
more than four seconds.
Lid Switch
The function of Lid switch is defined as below:
• The LCD backlight should be turned off when the Lid switch is pressed. The LCD backlight will be lighted
when the Lid switch is released again. This function is irrelevant to OS and should be always true when
the system is powered on.
• When the system is running under ACPI mode, the function of the Lid switch should follow the OS setting.
Auto-Dim
The system supports an automatic dimming of the LCD brightness when the AC power source is not available
(running on battery power). However, the users still can manually adjust the LCD brightness by their need. The
current user setting of brightness (along with current power source) will be saved across power down and be
restored at the next boot or resume.