4-22 www.hp.com Technical Reference Guide
System Support
Level 0—Cover removal indication is essentially disabled at this level. During POST, status bit is
cleared and no other action is taken by BIOS.
Level 1—During POST the message “The computer's cover has been removed since the last
system start up” is displayed and time stamp in CMOS is updated.
Level 2—During POST the “The computer's cover has been removed since the last system start
up” message is displayed, time stamp in CMOS is updated, and the user is prompted for the
administrator password. (A Setup password must be enabled in order to see this option).
Smart Cover Lock (Optional)
Some systems support an optional solenoid-operated locking bar that, when activated, prevents
the cover (hood) from being removed. The GPIO ports 44 and 45 of the SCH5317 I/O controller
provide the lock and unlock signals to the solenoid. A locked hood may be bypassed by removing
special screws that hold the locking mechanism in place. The special screws are removed with
the Smart Cover Lock Failsafe Key.
4.5.2 Power Management
This system provides baseline hardware support of ACPI- and APM-compliant firmware and
software. Key power-consuming components (processor, chipset, I/O controller, and fan) can be
placed into a reduced power mode either automatically or by user control. The system can then
be brought back up (“wake-up”) by events defined by the ACPI 2.0 specification. The ACPI
wake-up events supported by this system are listed as follows:
ACPI Wake-Up Event System Wakes From
Power Button Suspend or soft-off
RTC Alarm Suspend or soft-off
Wake On LAN (w/NIC) Suspend or soft-off
PME Suspend or soft-off
Serial Port Ring Suspend or soft-off
USB Suspend only
Keyboard Suspend only
Mouse Suspend only
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