Mac OS X: Apple Fibre Channel and SCSI PCI Card Can Prevent Deep Sleep

If the Apple Fibre Channel PCI card or other Apple SCSI PCI cards are installed in a computer, the computer cannot enter deep sleep mode.

Symptom

When the Apple Fibre Channel PCI card or another SCSI PCI card is installed in a Power Mac G5, Power Mac G4, or Xserve, the system does not sleep. Therefore, your system will not go into low-power mode during long periods of inactivity. Because the Power Mac G5, Power Mac G4 or Xserve is unable to sleep, the fans may appear to run excessively.

Products affected

• Mac OS X 10.1 and later
• Mac OS X Server 10.1 and later
• Mac OS X 10.2
• Mac OS X Server 10.2
• Mac OS X 10.3
• Mac OS X Server 10.3
• Mac OS X 10.4
• Mac OS X Server 10.4

with the following cards and computers:

SCSI/Fibre Channel Card	Computer
Apple Dual Channel Ultra2 LVD SCSI card	Power Mac G4 (AGP Graphics)
	Macintosh Server G4
	Macintosh Server G4 (Gigabit Ethernet)
Apple Dual Channel Ultra3 LVD SCSI card	Power Mac G4 (Digital Audio)
	Macintosh Server G4 (Digital Audio)
	Power Mac G4 (QuickSilver)
	Macintosh Server G4 (QuickSilver)
Apple Ultra160 Dual Channel SCSI card	Power Mac G4 (Gigabit Ethernet)
	Macintosh Server G4 (Gigabit Ethernet)
	Power Mac G4 (QuickSilver 2002)
	Macintosh Server G4 (QuickSilver 2002)
Apple Ultra160 Single Channel SCSI card	Xserve
Apple Fibre Channel PCI Card	Power Mac G4 (Mirrored Drive Doors)
	Power Mac G4 (FW 800)
	Power Mac G5
	Xserve (Slot Load)
	Xserve RAID

Solution

This is expected behavior. The fact that the system does not sleep causes no harm to the system or its components.

1. Open System Preferences.
   
2. Select Energy Saver.
   
3. Move the computer sleep slider to "Never", so that the computer does not attempt to sleep.

	Related Documents
	86407	About "Sleep" and "Deep Sleep"