Advanced Configuration and Power Interface Specification

ACPI Software Programming Model
Name Description Heading
_BAS
_BBN
_BCL
_BCM
Base Address – range base address, resource descriptor
field.
Bios Bus Number – returns the PCI bus number returned by
the BIOS.
Brightness Control Levels – returns a list of supported
brightness control levels.
Brightness Control Method – sets the brightness level of the
display device.
Section 19.2.8 page 778
Section 6.5.5 page 385
Section B.5.2 page 977
Section B.5.3 page 978
_BCT Battery Charge Time – returns time remaining to complete Section 10.2.2.10 page 580
charging battery.
_BDN Bios Dock Name – returns the Dock ID returned by the BIOS. Section 6.5.3 page 382
_BIF
_BIX
Battery Information – returns a Control Method Battery
information block.
Battery Information Extended – returns a Control Method
Battery extended information block.
Section 10.2.2.1 page 570
Section 10.2.2.2 page 572
_BLT Battery Level Threshold – set battery level threshold
Section 19.6.108 page 498
preferences.
_BM Bus Master – resource descriptor field. Section 19.2.8 page 778
_BMA
_BMC
_BMD
_BMS
_BQC
_BST
Battery Measurement Averaging Interval – Sets battery
measurement averaging interval.
Battery Maintenance Control – Sets battery maintenance and
control features.
Battery Maintenance Data – returns battery maintenance,
control, and state data.
Battery Measurement Sampling Time – Sets the battery
measurement sampling time.
Brightness Query Current – returns the current display
brightness level.
Battery Status – returns a Control Method Battery status
block.
Section 10.2.2.4 page 576
Section 10.2.2.12 page 582
Section 10.2.2.11 page 580
Section 10.2.2.5 page 576
Section B.5.4 page 978
Section 10.2.2.6 page 577
_BTH Battery Throttle Limit - specifies the thermal throttle limit of Section 10.2.2.7 page 578
battery for the firmware when engaging charging.
_BTM Battery Time – returns the battery runtime. Section 10.2.2.9 page 580
_BTP Battery Trip Point – sets a Control Method Battery trip point. Section 10.2.2.8 page 579
_CBA
_CCA
_CDM
Configuration Base Address – sets the CBA for a PCI Express
host bridge. See the PCI Firmware Specification, Revision 3.0
at “Links to ACPI-Related Documents” (http://uefi.org/acpi)
under the heading "PCI Sig".
Cache Coherency Attribute -- specifies whether a device and
its descendants support hardware managed cache coherency.
Clock Domain – returns a logical processor’s clock domain
identifier.
Section 6.2.17 page 328
Section 6.2.1 page 295
Version 6.0 259