Advanced Configuration and Power Interface Specification Hewlett-Packard Corporation


Predefined ACPI Names for Objects, Methods, and Resources



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      1.    Predefined ACPI Names for Objects, Methods, and Resources

The following table summarizes the predefined names for the ACPI namespace objects, control methods, and resource descriptor fields defined in this specification. Provided for each name is a short description and a reference to the section number and page number of the actual definition of the name. ACPI names that are predefined by other specifications are also listed along with their corresponding specification reference.

Note: All names that begin with an underscore are reserved for ACPI use only.

Table 5-67   Predefined ACPI Names




Name

Description

Section Page

_ACx

Active Cooling – returns the active cooling policy threshold values.

13.4.1

421

_ADR

Address – (1) returns the address of a device on its parent bus.
(2) returns a unique ID for the display output device.
(3) resource descriptor field.

7.1.1
B.6.1
18.1.8

197
703
548

_ALC

Ambient Light Chromaticity – returns the ambient light color chromaticity.

10.2.4

337

_ALI

Ambient Light Illuminance – returns the ambient light brightness.

10.2.2

336

_ALN

Alignment – base alignment, resource descriptor field.

18.1.8

548

_ALP

Ambient Light Polling – returns the ambient light sensor polling frequency.

10.2.6

341

_ALR

Ambient Light Response – returns the ambient light brightness to display brightness mappings.

10.2.5

337

_ALT

Ambient Light Temperature – returns the ambient light color temperature.

10.2.3

336

_ALx

Active List – returns a list of active cooling device objects.

13.4.2

422

_ART

Active cooling Relationship Table – returns thermal relationship information between platform devices and fan devices.

13.4.3

422

_ASI

Address Space Id – resource descriptor field.

18.1.8

548

_ASZ

Access Size – resource descriptor field.

18.1.8

548

_ATT

Type-Specific Attribute – resource descriptor field.

18.1.8

548

_BAS

Base Address – range base address, resource descriptor field.

18.1.8

548

_BBN

Bios Bus Number – returns the PCI bus number returned by the BIOS.

7.5.5

279

_BCL

Brightness Control Levels – returns a list of supported brightness control levels.

B.6.2

703

_BCM

Brightness Control Method – sets the brightness level of the display device.

B.6.3

703

_BCT

Battery Charge Time – returns time remaining to complete charging battery.

11.2.2.9

395

_BDN

Bios Dock Name – returns the Dock ID returned by the BIOS.

7.5.3

277

_BFS

Back From Sleep – inform AML of a wake event.

8.3.1

296

_BIF

Battery Information – returns a Control Method Battery information block.

11.2.2.1

387

_BIX

Battery Information Extended – returns a Control Method Battery extended information block.

11.2.2.2

389

_BLT

Battery Level Threshold – set battery level threshold preferences.

10.1.3

334

_BM

Bus Master – resource descriptor field.

18.1.8

548

_BMA

Battery Measurement Averaging Interval – Sets battery measurement averaging interval.

11.2.2.4

392

_BMC

Battery Maintenance Control – Sets battery maintenance and control features.

11.2.2.11

397

_BMD

Battery Maintenance Data returns battery maintenance, control, and state data.

11.2.2.10

395

_BMS

Battery Measurement Sampling Time – Sets the battery measurement sampling time.

11.2.2.5

392

_BQC

Brightness Query Current – returns the current display brightness level.

B.6.4

704

_BST

Battery Status – returns a Control Method Battery status block.

11.2.2.6

393

_BTM

Battery Time – returns the battery runtime.

11.2.2.8

394

_BTP

Battery Trip Point – sets a Control Method Battery trip point.

11.2.2.7

394

_CBA

Configuration Base Address – sets the CBA for a PCI Express host bridge. See the PCI Firmware Specification, Revision 3.0 at http://pcisig.com







_CDM

Clock Domain – returns a logical processor’s clock domain identifier.

7.2.1

208

_CID

Compatible ID – returns a device’s Plug and Play Compatible ID list.

7.1.2

198

_CRS

Current Resource Settings returns the current resource settings for a device.

7.2.2

209

_CRT

Critical Temperature – returns the shutdown critical temperature.

13.4.4

425

_CSD

C State Dependencies – returns a list of C-state dependencies.

9.4.2.2

317

_CST

C States – returns a list of supported C-states.

9.4.2.1

315

_DCK

Dock – sets docking isolation. Presence indicates device is a docking station.

7.5.2

277

_DCS

Display Current Status – returns status of the display output device.

B.6.6

704

_DDC

Display Data Current – returns the EDID for the display output device.

B.6.5

704

_DDN

Dos Device Name – returns a device logical name.

7.1.3

198

_DEC

Decode – device decoding type, resource descriptor field.

18.1.8

548

_DGS

Display Graphics State – return the current state of the output device.

B.6.7

705

_DIS

Disable – disables a device.

7.2.3

209

_DMA

Direct Memory Access – returns a device’s current resources for DMA transactions.

7.2.4

209

_DOD

Display Output Devices – enumerate all devices attached to the display adapter.

B.4.2

697

_DOS

Disable Output Switching – sets the display output switching mode.

B.4.1

696

_DSM

Device Specific Method – executes device-specific functions.

10.14.1

365

_DSS

Device Set State – sets the display device state.

B.6.8

705

    _DSW

    Device Sleep Wake – sets the sleep and wake transition states for a device.

    8.2.1

    287

_DTI

Device Temperature Indication – conveys native device temperature to the platform.

13.4.5

425

_Exx

Edge GPE – method executed as a result of a general-purpose event.

6.6.5.1

172

_EC

Embedded Controller – returns EC offset and query information.

14.12

461

_EDL

Eject Device List – returns a list of devices that are dependent on a device (docking).

7.3.1

241

_EJD

Ejection Dependent Device – returns the name of dependent (parent) device (docking).

7.3.2

241

_EJx

Eject – begin or cancel a device ejection request (docking).

7.3.3

243

_FDE

Floppy Disk Enumerate – returns floppy disk configuration information.

10.9.1

349

_FDI

Floppy Drive Information – returns a floppy drive information block.

10.9.2

350

_FDM

Floppy Drive Mode – sets a floppy drive speed.

10.9.3

351

_FIF

Fan Information – returns fan device information.

13.3.1.1

417

_FIX

Fixed Register Resource Provider – returns a list of devices that implement FADT register blocks.

7.2.5

212

_FPS

Fan Performance States – returns a list of supported fan performance states.

13.3.1.2

418

_FSL

Fan Set Level – Control method that sets the fan device’s speed level (performance state).

13.3.1.3

419

_FST

Fan Status – returns current status information for a fan device.

13.3.1.4

420

_GAI

Get Averaging Interval – returns the power meter averaging interval.

11.4.5

403

_GHL

Get Hardware Limit – returns the hardware limit enforced by the power meter.

11.4.7

404

_GL

Global Lock – OS-defined Global Lock mutex object.

6.7.1

191

_GLK

Global Lock – returns a device’s Global Lock requirement for device access.

7.5.7

281

_GPD

Get Post Data – returns the value of the VGA device that will be posted at boot.

B.4.4

701

_GPE

General Purpose Events – (1) predefined Scope (\_GPE.)
(2) Returns the SCI interrupt associated with the Embedded Controller.

6.3.1
14.11

158
460

_GRA

Granularity – address space granularity, resource descriptor field.

18.1.8

548


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