Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
Bits defined in Capabilities DWORD2 provide information regarding OS supported features.
Contents in DWORD2 are passed one-way; the OS will disregard the corresponding bits of
DWORD2 in the Return Code.
10.2.2.4 _BMA (Battery Measurement Averaging Interval)
This object is used to set the averaging interval of the battery capacity measurement, in milliseconds.
The Battery Measurement Averaging Interval is the length of time within which the battery averages
the capacity measurements specified in _BST, such as remaining capacity and present rate.
The OSPM may read the Max Average Interval and Min Average Interval with _BIX during boot
time, and set a specific average interval within the range with _BMA.
Arguments: (1)
Arg0 – AveragingInterval (Integer(DWORD)) the averaging interval of battery capacity
measurement:
0x00000001 – 0xFFFFFFFF (in units of millisecond)
Return Value:
An Integer (DWORD) containing a result code as follows:
0x00000000 – Success.
0x00000001 – Failure to set Battery Measurement Averaging Interval because it is out of the
battery’s measurement capability.
0x00000002 – 0xFFFFFFFF – Reserved.
10.2.2.5 _BMS (Battery Measurement Sampling Time)
This object is used to set the sampling time of the battery capacity measurement, in milliseconds.
The Sampling Time is the duration between two consecutive measurements of the battery’s
capacities specified in _BST, such as present rate and remaining capacity. If the OSPM makes two
succeeding readings through _BST beyond the duration, two different results will be returned.
The OSPM may read the Max Sampling Time and Min Sampling Time with _BIX during boot time,
and set a specific sampling time within the range with _BMS.
Arguments: (1)
Arg0 – SamplingTime (Integer(DWORD)) the sampling time of battery capacity measurement:
0x00000001 – 0xFFFFFFFF (in units of millisecond)
Return Value:
An Integer (DWORD) containing a result code as follows:
0x00000000 – Success.
0x00000001 – Failure to set Battery Measurement Sampling Time because it is out of the battery’s
measurement capability.
0x00000002 – 0xFFFFFFFF – Reserved.
576 April, 2015 Version 6.0