Summary

Chapter 6: Fundamental Laptops and Portable Devices 21ACPI StandardS4S5Power Management StateThe CPU and RAM are off. The contents of RAM have been saved to atemporary file on the hard disk. This mode is also called “Saved toDisk.” In Windows XP, this state is known as the Hibernate mode.The computer is off and nothing has been saved.Technicians frequently are required to configure power settings by changing the settingsfound in BIOS. Configuring power settings in BIOS affects the following conditions:■■■■System statesBattery and AC modesThermal managementCPU PCI bus power managementFigure 6-14 shows an example of power settings in BIOS.Figure 6-14BIOS SettingsNoteWhen working in Windows XP, the ACPI power management mode must be enabled in BIOS toallow the OS to configure all the power management states. There is no standard name for eachpower management state. Manufacturers can use different names for the same state.