公开(公告)号：JPH1039962A

公开(公告)日：1998-02-13

申请号：JP10595797

申请日：1997-04-23

Applicant: IBM

Inventor： MICHAEL WILLIAM CLARKE ,  HEANEY JAMES ALFRED ,  NORRIS DUANE EDWARD ,  PAUL HARRISON BENSON IV

IPC: G06F1/32 ,  G06F1/26 ,  G06F1/30

Abstract: PROBLEM TO BE SOLVED: To provide a sure and inexpensive system for holding data in the case that an AC power fault is generated by providing a power management circuit for selectively changing the state of a computer system between a normal operation state and a suspension state in response to power source interruption urgency control signals. SOLUTION: A power source is operated so as to generate control signals to the power management circuit when an external power source stops the power supply of a prescribed level while this computer system 10 is in the normal operation state. The normal operation state is a first power source state, and in the state, the power source supplies system power from the external power source to the system 10 and supplies auxiliary power from the external power source to the power management circuit. In the suspension state, codes to be executed on a CPU is reversibly interrupted so as to resume the execution of the codes on the CPU after the power source is changed to the first power source state. The power management circuit changes the system 10 to the suspension state in response to the activation of the control signals by the power source.

公开(公告)号：PL319043A1

公开(公告)日：1997-07-21

申请号：PL31904395

申请日：1995-08-31

Applicant: IBM

Inventor： CRUMP DWAYNE THOMAS ,  PANCOAST STEVEN TAYLOR ,  NORRIS DUANE EDWARD ,  BENSON PAUL HARRISON IV

IPC: G06F1/00 ,  G06F1/26 ,  G06F1/32 ,  G06F11/14 ,  G06F1/30

Abstract: A computer system having four states of power management: a normal operating state, a standby state, a suspend state, and an off state. A control unit controls transitions between the various states. The standby state is characterized by devices, such as a video controller and a hard drive, being placed into a low-power mode transparent to the operating system and the applications executing on the computer system. The suspend state is characterized by executing code being interrupted and the state of the computer system being saved to a file on the hard drive in such a manner that system power may be removed after the state of the computer system is saved to the hard drive. Later, after system power is restored, the state of the computer system is resumed by reading from the hard drive and loading it in such a manner that the operating system and application programs are not adversely affected. The normal operating state and the off state correspond to the typical on and off states of more conventional computer systems. A single switch causes transitions between the various states. A visual feedback device, such as an LED is used to indicate the state of the computer system. While no power management driver is active, the control unit delays state transitions until a suitable power management driver is active.