Selecting a power state based on predefined parameters

Details Selecting a power state based on predefined parameters Selecting a power state based on predefined parameters

2007-11-13

2007-11-13

Lee, Thomas (Department: 2115)

Electrical computers and digital processing systems: support

Computer power control

Power conservation

C713S300000, C713S320000, C713S340000

Reexamination Certificate

active

10984993

ABSTRACT:
An algorithm automatically selects a power state based on device configuration parameters. The selected power state may then be returned and/or automatically implemented in a shutdown of the device. The parameters can include whether the device supports a system battery, whether the device is connected to an uninterruptible power supply, whether a value is available for remaining battery life, whether the device is receiving AC power and/or whether a hibernate fail safe feature is available. A shutdown failure algorithm may also be included. The shutdown failure algorithm detects a failed attempt to shut down the device using a selected power state. The power state selection is changed and shutdown is then re-attempted. If shutdown again fails, a force shutdown flag is set. If shutdown again fails, a shutdown failure is reported.

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“Advanced Configuration and Power Interface Specification”, Revision 3.0, Sep. 2, 2004, 602 pages.

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