Network Device Support And Power Management - Lenovo ThinkPad 380E Setup Manual

Network device support and power management

Windows 2000 has a built-in mechanism that enables the system to wake up from a sleep
mode and to detect a wakeup signal from a PCI LAN card. This capability is referred to as
Wake-On-LAN (WOL). WOL depends on the type of LAN device used, the supported
device driver, and the computer ACPI BIOS in use. Under Windows 2000, some ACPI-
support ThinkPad models feature WOL capability. For the current release of Windows 2000,
the following ThinkPad models support WOL capability through their ACPI system BIOS:
ThinkPad models 390, 390E, and 390X
ThinkPad models 570 and 570E
ThinkPad models 600, 600E, and 600X
ThinkPad models 770E, 770X, and 770Z
Even though the above ThinkPad models support WOL capability through their system BIOS,
the type of network interface card (NIC) can determine WOL capability. For the above
mentioned ThinkPad 600 Series models and 770 Series models, WOL is supported on
Windows 2000, if the computer docked to the IBM PC Card Enabler with Advanced EtherJet
Port. For the ThinkPad 390 Series models and 570 Series models, WOL is supported when
the computer is docked to the IBM Enhanced Port Replicator with Advanced EtherJet Port.
For the ThinkPad 390 and 570 Series models, WOL is supported for Standby (S1 and S3
states) and Hibernation (S4 state) modes.
Other NICs installed in docking stations, and their supported device drivers under Windows
2000 will determine whether the NIC can "bring the computer out of Standby". If enabled for
WOL through the Device Manager, the maximum global sleep state that the system BIOS can
be set to is S1 state. When network activity is detected while the system is in a S1 sleep state,
Windows 2000 will wake the system from its sleep mode. The S1 sleep state is categorized
as the lowest level of Standby: the processor is in power saving mode, but the remaining
devices on the system are either active or in a minimum device sleep state. For the above
mentioned ThinkPad models, WOL capability from other sleeps states, such as S3 (Standby)
or S4 (Hibernation), are not supported under Windows 2000.
The following PCI NICs support WOL from the S1 state when a ThinkPad 600 Series model
or 770 Series model ACPI-supported computer is docked to an IBM SelectaDock-III docking
station:
§ IBM PCI Netfinity 10/100 Ethernet Adapter 2
§ IBM EtherJet PCI Management Adapter
§ IBM EtherJet PCI Adapter
§ IBM EtherJet PCI 100/10 Adapter with Wake on LAN
§
IBM 16/4 Token-Ring PCI Adapter 2
Note that for the ThinkPad 600 and 770 Series ACPI-supported models, when the maximum
global sleep state for the system is set to S1 and WOL is enabled, the warm-swapping feature
on ThinkPad computers running Windows 2000 will be disabled. As described in a previous
section of this document, "
ThinkPad models
", some ACPI-supported ThinkPad models support warm -swapping in the
swappable bay slot. The warm -swapping feature requires the global system sleep state be set
to S3 state as defined by the system BIOS and operating system. If WOL is enabled on the
system, the maximum global system sleep state will be set to S1, thus preventing the system
from entering the S3 sleep state. Because the computer cannot enter S3 sleep state, the user
will be unable to warm-swap the swappable bay device when WOL is enabled. The users'
request to eject the device from the swappable bay slot will be "rejected" by the operating
system. This is a current ACPI design limitation and currently no workaround exists. If this
Hot and Warm swapping support for ACPI-supported