Compaq iPAQ 1.0 Technical Reference Manual page 150

Ipaq series of desktop personal computers
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Chapter 8 BIOS ROM
Three power states are defined under power management:
On - The computer is running, all subsystems are on and drawing full power. Any activity in the
following subsystems will reset the activity timer, which has a default setting of 15 minutes before
Standby entered:
a.
Keyboard (PS/2 only)
b.
Mouse (PS/2 only)
c.
Serial port
d.
Hard drive
Standby - The computer is in a low power state: video is off, some subsystems may be drawing
less power, and the microprocessor is halted except for servicing interrupts. Video graphics
controller is under driver control and/or VSYNC is off and the power supply fan is turned off. Any
of the following activities will generate a wake-up SMI and return the system to On:
a.
Keyboard (PS/2 only)
b.
Mouse (PS/2 only)
c.
Serial port
d.
Hard drive
e.
RTC Alarm
f.
Power Button
If no APM connection is present, the BIOS will set an APM timer to 45 minutes, at which time the
Suspend will be entered if no activity has occurred. This function can be defeated (so that Suspend
will not be achieved). If an APM connection is present, the BIOS APM timer is not used and
Suspend is entered only by user request either through an icon in Windows 95 or by pressing and
releasing the power button under 4 seconds.
Suspend - The computer is in a low power state: video graphics controller is under driver control
and/or HSYNC and VSYNC are off, some subsystems may be drawing less power, and the
microprocessor is halted except for servicing interrupts. Any of the following activities will
generate a wake-up SMI and return the system to On:
a.
Keyboard (PS/2 only)
b.
Mouse (PS/2 only)
c.
Serial port
d.
Diskette drive
e.
Hard drive
f.
RTC Alarm
g.
Network interface controller
8-16
Compaq iPAQ Series of Desktop Personal Computers
Review Copy - January 2001

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