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Chapter 10—Video and Audio
In Windows 9x and 2000, you need to enable this feature if you
want to use it because it’s turned off by default. To enable it, open
the Display properties in the Control Panel, switch to the Screen
Saver tab and make sure the Energy Star low-power setting and
Monitor shutdown setting are checked. You can adjust how long
the system remains idle before either the monitor picture is
blanked or the monitor shuts down completely. Windows Me
defaults to suspend after 10 minutes, but timings can be adjusted
with any of these versions of Windows.
Table 10.5 summarizes the DPMS modes.
Table 10.5 Display Power Management Signaling
State Horizontal Vertical Video Power Savings Recovery Time
On Pulses Pulses Active None Not
applicable
Standby No pulses Pulses Blanked Minimal Short
Suspend Pulses No pulses Blanked Substantial Longer
Off No pulses No pulses Blanked Maximum System dependent
Microsoft and Intel developed a more broadly based power management
specification called APM (advanced power management),
and Microsoft developed an even more advanced power management
specification called ACPI (advanced configuration and power
interface) for use with Windows 98 and beyond. Table 10.6 summarizes
the differences between DPMS, APM, and ACPI.
Table 10.6 Power Management Standards Compared
Standard Devices Controlled How Implemented Notes
DPMS Monitor and video card Drivers for display and DPMS will work
video card; must be along-side APM or
enabled by operating ACPI; user defines
system, such as timer intervals for
Windows 9x/2000/Me various modes
via Control Panel listed.
APM Monitor, hard disks, Implemented in BIOS; User defines timer
other peripherals enabled in BIOS and in intervals for
operating system various devices in
(Windows 9x/2000/Me BIOS or operating
via Control Panel) system.