ThinkPad cannot enter the deeper Advanced Configuration and Power Interface (ACPI) processor idle sleep states

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ThinkPad cannot enter the deeper Advanced Configuration and Power Interface (ACPI) processor idle sleep states - ThinkPad T60, T60p

Symptoms

The ThinkPad system cannot enter C3 or C4 power states, resulting in increased power consumption and shorter battery life.

Affected configuration

The following ThinkPad systems may be affected by this symptom:

ThinkPad T60, T60p

Solution

Download the Microsoft patch from document KB918005, http://support.microsoft.com/kb/918005.

Additional information

The symptom occurs when the USB 2.0 driver leaves the asynchronous scheduler component running continuously. This prevents the processor from entering the deeper ACPI processor idle sleep states, or C-states. C-states save power when the processor is not busy. These states range from C0 to C3 or C4. Typically, an idle laptop uses the C3 and C4 states to preserve battery power. If an idle laptop cannot enter or maintain the C3 or C4 states, the battery power drains more quickly.

The power states are defined as follows:

C0 - full power
C1 - auto halt
C2 - stop clock
C3 - sleep (suspend)
C4 - deep sleep (hibernation)

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Country Availability
Available	Worldwide

Document ID : HT000925
Legacy Document ID : MIGR-66004
Last Updated :

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