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Wake on LAN enablement in conjuction with Power Management Sleep and Suspend modes. Disclosure Number: IPCOM000126292D
Original Publication Date: 2005-Jul-12
Included in the Prior Art Database: 2005-Jul-12
Document File: 1 page(s) / 41K

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This improvement allows a Wake on LAN enabled system to be brought out of a state of Suspend or Standby through the receipt of a Wake on LAN magic packet through a Wake on LAN enabled Local Area Network adapter. This allows customers who implement Wake on LAN to turn on systems during off-peak hours to also resume systems that have been inadvertently left on and allowed to enter either a sleep or suspend state or set to enter a sleep or suspend state. This can be used in Desktop, Laptop and embedded systems in smart devices where a device would go into a Suspend or Standby state to conserve energy.

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Wake on LAN enablement in conjuction with Power Management Sleep and Suspend modes.

Currently there is no way to implement Wake on LAN function in conjunction with available industry standard Power Management via the ACPI or APM interface. This inhibits the coexistence of corporate power management standards with currently available systems management and deployment tools which implement and enable Wake on LAN. The drawback to this is that ACPI is an industry standard and this change would be a variation of the standard.

ACPI supports a variety of power states. Each state represents a different level of power, from fully powered up to completely powered down, with partial levels of power in each intermediate state. This is a summary of the power states:

S0 On and fully operational.

S1 System is in low power mode (a.k.a. sleep mode). The CPU clock is stopped, but RAM is powered on and being refreshed.

S2 Similar to S1, but power is removed from the CPU.

S3 Suspend to RAM (a.k.a. standby mode). Basically, most components are shutdown except RAM.

S4 Suspend to disk (a.k.a. hibernate mode). The memory contents are swapped to the disk drive, and then reloaded into RAM when the system is awakened.

S5 Power off.

To accomplish this a system must have a bios with a flag to resume normal processing after receiving the magic packet. A system in ACPI states S1, S2, or S3 will maintain active receiving function through the preexisting Wake on LAN adapter. Upon receipt of the...