Article Number: 000134483
Energy Efficient Ethernet (EEE) Low Power Idle (LPI) mode defined in IEEE 802.3az optionally allows power saving by switching off part of the integrated LAN controller and (in this example) the Intel 82579 functionalities when no data must be transmitted or received.
Decision on whether the 82579 transmit path should enter Low-Power Idle mode or exit Low-Power Idle mode is done on the integrated LAN controller level and communicated to the 82579 to allow power saving in the transmit circuitry.
Information on whether Link Partner has entered Low-Power Idle mode is detected by the 82579 and communicated to the integrated LAN controller to allow for power saving in the receive circuitry.
SIPS is a software-based power-saving feature. This feature is only supported in the S0 state and can be enabled or disabled using the advanced tab of the Windows driver or through DMiX. The power savings from this feature depends the link speed of the 82579. SIPS is NOT enabled when in LPI mode.
SIPS is designed to save power in the 82579 by negotiating to the lowest possible link speed when both the network is idle and the monitor is turned off due to inactivity. The SIPS feature is activated based on both of the following conditions:
Figure 1 - Intel Example
Figure 2 - Realtek Example
If possible, test the network after disabling the EEE or Green Ethernet at the network switch.
On most models EEE LPI is enabled by default, but older systems may have shipped with EEE disabled as it was a new technology. Enterprise customers can use the Get-NetAdapterAdvancedProperty PowerShell command to list all network adapter settings on a system and poll their environment for systems with the feature on or off. Customers can add additional options to filter out the additional virtual Windows adapters example: Get-NetAdapterAdvancedProperty -interfacedescription *[irk][nie][tal]*.
Figure 3 - PowerShell
Latitude, Latitude E6320, Latitude E6420, Latitude E6420 ATG, Latitude E6520, OptiPlex 790, OptiPlex 990, Precision M4600, Precision M6600, Precision T1600
06 Dec 2023
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