Advanced Configuration and Power Interface Specification

11.2.1 Evaluating Thermal Device Lists..................................................................... 602
11.2.2 Evaluating Device Thermal Relationship Information ..................................... 603
11.3 Fan Device.................................................................................................................. 603
11.3.1 Fan Objects..................................................................................................... 604
11.4 Thermal Objects.......................................................................................................... 607
11.4.1 _ACx (Active Cooling) ..................................................................................... 608
11.4.2 _ALx (Active List) ............................................................................................ 609
11.4.3 _ART (Active Cooling Relationship Table)...................................................... 609
11.4.4 _CRT (Critical Temperature)........................................................................... 612
11.4.5 _CR3 (Warm/Standby Temperature) .............................................................. 612
11.4.6 _DTI (Device Temperature Indication) ............................................................ 612
11.4.7 _HOT (Hot Temperature) ................................................................................ 613
11.4.8 _MTL (Minimum Throttle Limit) ....................................................................... 613
11.4.9 _NTT (Notification Temperature Threshold) ................................................... 613
11.4.10 _PSL (Passive List)....................................................................................... 614
11.4.11 _PSV (Passive) ............................................................................................. 614
11.4.12 _RTV (Relative Temperature Values) ........................................................... 614
11.4.13 _SCP (Set Cooling Policy) ............................................................................ 615
11.4.14 _TC1 (Thermal Constant 1) .......................................................................... 618
11.4.15 _TC2 (Thermal Constant 2) .......................................................................... 618
11.4.16 _TFP (Thermal fast Sampling Period) .......................................................... 619
11.4.17 _TMP (Temperature)..................................................................................... 619
11.4.18 _TPT (Trip Point Temperature) ..................................................................... 619
11.4.19 _TRT (Thermal Relationship Table).............................................................. 620
11.4.20 _TSN (Thermal Sensor Device) .................................................................... 621
11.4.21 _TSP (Thermal Sampling Period) ................................................................. 621
11.4.22 _TST (Temperature Sensor Threshold) ........................................................ 621
11.4.23 _TZD (Thermal Zone Devices)...................................................................... 622
11.4.24 _TZM (Thermal Zone Member)..................................................................... 622
11.4.25 _TZP (Thermal Zone Polling)........................................................................ 622
11.5 Native OS Device Driver Thermal Interfaces .............................................................. 623
11.6 Thermal Zone Interface Requirements ....................................................................... 623
11.7 Thermal Zone Examples............................................................................................. 624
11.7.1 Example: The Basic Thermal Zone................................................................. 624
11.7.2 Example: Multiple-Speed Fans ....................................................................... 626
11.7.3 Example: Thermal Zone with Multiple Devices ............................................... 628
12
ACPI Embedded Controller Interface Specification ................................ 635
12.1 Embedded Controller Interface Description ................................................................ 635
12.2 Embedded Controller Register Descriptions............................................................... 639
12.2.1 Embedded Controller Status, EC_SC (R) ....................................................... 639
12.2.2 Embedded Controller Command, EC_SC (W)................................................ 640
12.2.3 Embedded Controller Data, EC_DATA (R/W)................................................. 640
12.3 Embedded Controller Command Set .......................................................................... 640
12.3.1 Read Embedded Controller, RD_EC (0x80) ................................................... 641
12.3.2 Write Embedded Controller, WR_EC (0x81)................................................... 641
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