Product Description 
33 
1.16.1.2  Wake-up Devices and Events 
Table 8 lists the devices or specific events that can wake the computer from specific 
states. 
Table 8.  Wake-up Devices and Events 
These devices/events can wake up the computer…  …from this state 
Power switch  S3, S4, S5 
RTC alarm  S3, S4, S5 
LAN   S3, S4, S5 
USB  S3 
PME# signal  S3, S4, S5 
WAKE# signal  S3, S4, S5 
Serial port  S3 
PS/2  S3, S4, S5 
Notes: 
•  S4 implies operating system support only. 
•  USB ports are turned off during S4/S5 states. 
 
NOTE 
The use of these wake-up events from an ACPI state requires an operating system that 
provides full ACPI support.  In addition, software, drivers, and peripherals must fully 
support ACPI wake events.