Management of power states in a portable computing device

Details Management of power states in a portable computing device Management of power states in a portable computing device

2005-08-02

2010-06-29

Du, Thuan N (Department: 2116)

Electrical computers and digital processing systems: support

Computer power control

Power conservation

C713S324000

Reexamination Certificate

active

07747886

ABSTRACT:
Embodiments of the present invention provide a method and apparatus for managing power states in a personal computing device, while maintaining a perception by the user of “instant on” functionality. In various embodiments of the invention, the power states are presented to the user as a simple on/off option and the power management protocol is not visible within the user interface of the personal computing device thereby providing the user with the impression that the system is operating with a simple binary on/off protocol. In one embodiment of the invention, the personal computing device is operable to transition between a set of power states that include: 1) an “on” power state wherein the display is on and the customer can use all input devices; 2) a “ready” state wherein the display is turned off, but some modules, such as a radio module, remain on; 3) an “off” state wherein the personal computing device turns off after a slight pause, but a “booted kernel” is held in SDRAM; and 4) a “dead” state wherein none of the modules of the personal computing device are powered and the device must be cold booted to restart.

REFERENCES:
patent: 5710929 (1998-01-01), Fung
patent: 6418536 (2002-07-01), Park
patent: 7096309 (2006-08-01), Ginosar
patent: 7228443 (2007-06-01), Nishikawa
patent: 7296171 (2007-11-01), Hahn et al.

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