Advanced Configuration and Power Interface Specification

Power Source and Power Meter Devices
10.4.8 _PMD (Power Metered Devices)
This object evaluates to a package of device names. Each name corresponds to a device in the ACPI
namespace that is being measured by the power meter device. The measurement reported by the
power meter is roughly correspondent to the total power draw of all the devices returned.
If this control method is present, the package needs to contain at least 1 device. On a system that
supports power metering, a system power meter that measures the power draw of the entire system
should always be present and have a _PMD that contains \_SB as its sole entry.
Arguments:
None
Return Value:
A variable-length Package consisting of references to devices being measured by the power meter.
Package {
Power Meter[0]
Power Meter[1]
...
Power Meter[n]
}
// NamePath
// NamePath
// NamePath
10.5 Example: Power Source and Power Meter Namespace
Figure 10-64 below shows the ACPI namespace for a computer with a power meter, AC adapter and
two batteries associated with a docking station which itself has an AC adapter.
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