Method and apparatus for detecting AC removal
First Claim
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1. A method comprising:
- detecting AC power removal from a computing system, the computing system having at least one higher CPU performance level for AC power operation, at least one lower CPU performance level for DC power operation, and a power management software to transition the CPU to a lower CPU performance level upon the removal of AC power; and
transitioning the CPU to a lower performance level before a residual AC power is exhausted such that unwanted system shutdown is avoided.
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Abstract
A method and apparatus for transitioning the CPU of a computer system to a lower performance level upon removal of AC power. Circuitry within the system input power control detects the removal of the AC power. The circuitry generates an event that causes power management software to immediately transition the CPU to a lower performance level sufficient to prevent the unwanted shutdown of the system. The AC power removal detection and CPU transition are effected while the system maintains an operational power level due to residual power in the system capacitors.
15 Citations
18 Claims
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1. A method comprising:
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detecting AC power removal from a computing system, the computing system having at least one higher CPU performance level for AC power operation, at least one lower CPU performance level for DC power operation, and a power management software to transition the CPU to a lower CPU performance level upon the removal of AC power; and
transitioning the CPU to a lower performance level before a residual AC power is exhausted such that unwanted system shutdown is avoided. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A machine-readable medium that provides executable instructions, which when executed by a processor, cause the processor to perform a method, the method comprising:
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receiving a signal indicating AC power removal from a computing system, the computing system having at least one higher CPU performance level for AC power operation, at least one lower CPU performance level for DC power operation, and a power management software to transition the CPU to a lower CPU performance level upon the removal of AC power; and
transitioning the CPU to a lower performance level before a residual AC power is exhausted such that unwanted system shutdown is avoided. - View Dependent Claims (8, 9, 10, 11, 12, 14, 15, 16, 17, 18)
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13. An apparatus comprising:
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an AC power removal detection unit to detect AC power removal from a computing system, the computing system having at least one higher CPU performance level for AC power operation, at least one lower CPU performance level for DC power operation, and a power management software to transition the CPU to a lower CPU performance level upon the removal of AC power; and
a CPU performance level transition unit to transition the CPU to a lower performance level before a residual AC power is exhausted such that unwanted system shutdown is avoided.
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Specification