Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
9.18.10 _TIV (Timer Values) ...................................................................................... 547
9.18.11 ACPI Wakeup Alarm Events ......................................................................... 547
9.18.12 Relationship to Real Time Clock Alarm ....................................................... 547
9.18.13 Time and Alarm device as a replacement to the RTC .................................. 547
9.18.14 Relationship to UEFI time source.................................................................. 547
9.18.15 Example ASL code ....................................................................................... 548
9.19 Generic Buttons Device .............................................................................................. 552
9.19.1 Button Interrupts.............................................................................................. 552
9.19.2 Button Usages and Collections ....................................................................... 553
9.19.3 Example .......................................................................................................... 555
9.20 NVDIMM Devices........................................................................................................ 556
9.20.1 Hot Plug Support............................................................................................ 557
10
Power Source and Power Meter Devices ................................................. 561
10.1 Smart Battery Subsystems ......................................................................................... 561
10.1.1 ACPI Smart Battery Status Change Notification Requirements...................... 564
10.1.2 Smart Battery Objects ..................................................................................... 565
10.1.3 _SBS (Smart Battery Subsystem) .................................................................. 566
10.2 Control Method Batteries ............................................................................................ 568
10.2.1 Battery Events................................................................................................. 569
10.2.2 Battery Control Methods ................................................................................. 569
10.3 AC Adapters and Power Source Objects.................................................................... 583
10.3.1 _PSR (Power Source)..................................................................................... 584
10.3.2 _PCL (Power Consumer List) ......................................................................... 584
10.3.3 _PIF (Power Source Information).................................................................... 584
10.3.4 _PRL (Power Source Redundancy List) ......................................................... 585
10.4 Power Meters.............................................................................................................. 586
10.4.1 _PMC (Power Meter Capabilities)................................................................... 586
10.4.2 _PTP (Power Trip Points) ............................................................................... 588
10.4.3 _PMM (Power Meter Measurement) ............................................................... 589
10.4.4 _PAI (Power Averaging Interval)..................................................................... 589
10.4.5 _GAI (Get Averaging Interval)......................................................................... 589
10.4.6 _SHL (Set Hardware Limit) ............................................................................. 590
10.4.7 _GHL (Get Hardware Limit) ............................................................................ 590
10.4.8 _PMD (Power Metered Devices)..................................................................... 591
10.5 Example: Power Source and Power Meter Namespace............................................. 591
11
Thermal Management................................................................................. 593
11.1 Thermal Control .......................................................................................................... 593
11.1.1 Active, Passive, and Critical Policies .............................................................. 594
11.1.2 Dynamically Changing Cooling Temperature Trip Points ............................... 595
11.1.3 Detecting Temperature Changes .................................................................... 596
11.1.4 Active Cooling ................................................................................................ 598
11.1.5 Passive Cooling .............................................................................................. 599
11.1.6 Critical Shutdown ............................................................................................ 600
11.2 Cooling Preferences .................................................................................................. 601
xxii April, 2015 Version 6.0