Chapter 8 System BIOS

8.6.1.3 Suspend

Suspend is not supported in the Independent PM mode.

8.6.1.4 System OFF

When the system is turned Off but still plugged into a live AC outlet the NIC, ICH2, and I/O components continue to receive auxiliary power in order to power-up as the result of a Magic Packet™ being received over a network. Some NICs are able to wake up a system from Standby in PM, most require their Windows/NT driver to reset them after one wake-up.

8.6.1.5 Waking Up in Independent PM

Activity of either of the following devices will cause the system to wake up with the screen restored:

♦Keyboard

♦Mouse (if driver installed)

The hard drive will not spin up until it is accessed. Any hard drive access will cause it to wake up and resume spinning. Since the BIOS returns to the currently running software, it is possible for the drive to spin up while the system is in Standby with the screen blanked.

8.6.2 ACPI SUPPORT

These systems meet the hardware and firmware requirements for being ACPI compliant. This system supports the following ACPI functions:

♦PM timer

♦Power button

♦Power button override

♦RTC alarm

♦Sleep/Wake logic (S1,S3, S4 (Windows 2000), S5)

♦C1 state (Halt)

♦PCI Power Management Event (PME)

8.7USB LEGACY SUPPORT

The BIOS ROM checks the USB port, during POST, for the presence of a USB keyboard. This allows a system with only a USB keyboard to be used during ROM-based setup and also on a system with an OS that does not include a USB driver.

On such a system a keystroke will generate an SMI and the SMI handler will retrieve the data from the device and convert it to PS/2 data. The data will be passed to the keyboard controller and processed as in the PS/2 interface. Changing the delay and/or typematic rate of a USB keyboard though BIOS function INT 16 is not supported.

8-16Compaq D315 and hp d325 Personal Computers

Featuring the AMD Athlon XP Processor

Second Edition - April 2003