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36 Chapter 1
Power Management Function (ACPI Support Function)
Device Standby Mode
• Independent power management timer for hard disk drive devices (zero to 15 minutes, time step = one
minute).
• Hard disk drive goes into Standby mode (for ATA standard interface).
• Disable V-sync to control the VESA DPMS monitor.
• Resume method: device activated (keyboard for DOS, keyboard & mouse for Windows).
• Resume recovery time: three to five seconds.
Global Standby Mode
• Global power management timer (two to 120 minutes, time step = 10 minutes).
• Hard disk drive goes into Standby mode (for ATA standard interface).
• Disable H-sync and V-sync signals to control the VESA DPMS monitor.
• Resume method: return to original state by pushing external switch button, modem ring in, keyboard and
mouse for APM mode.
• Resume recovery time: seven to 10 seconds.
Suspend Mode
• Independent power management timer (two to 120 minutes, time step = 10 minutes) or pushing external
switch button.
• CPU goes into SMM.
• CPU asserts STPCLK# and goes into the Stop Grant state.
• LED on the panel turns amber colour.
• Hard disk drive goes into SLEEP mode (for ATA standard interface).
• Disable H-sync and V-sync signals to control the VESA DPMS monitor.
• Ultra I/O and VGA chip go into power saving mode.
• Resume method: return to original state by pushing external switch button, modem ring in, keyboard and
mouse for APM mode.
• Return to original state by pushing external switch button, modem ring in and USB keyboard for ACPI
mode.
ACPI
• ACPI specification 1.0b
• S0, S1, S3 and S5 sleep state support
• Onboard device power management support
• Onboard device configuration support