Advanced Configuration and Power Interface Specification

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Thermal Management Objects”). The _TSP object contains a time interval that OSPM uses to poll the hardware to sample the temperature. Whenever the time value returned by _TSP has elapsed, OSPM will evaluate _TMP to sample the current temperature (shown as Tn in the above equation). Then OSPM will use the sampled temperature and the passive cooling temperature trip point (_PSV) (which is the target temperature Tt) to evaluate the equation for �P. The granularity of �P is determined by the CPU duty width of the system. Note: Equation #1 has an implied formula. Equation #2: Pn = Pn-1 + HW[- �P ] where 0%
11.2 Cooling Preferences Advanced Configuration and Power Interface Specification A robust OSPM implementation provides the means for the end user to convey a preference (or a level of preference) for either performance or energy conservation to OSPM. Allowing the end user to choose this preference is most critical to mobile system users where maximizing system run-time on a battery charge often has higher priority over realizing maximum system performance. For example, if a user is taking notes on her PC in a quiet environment, such as a library or a corporate meeting, she may want the system to emphasize passive cooling so that the system operates quietly, even at the cost of system performance. A user preference towards performance corresponds to the Active cooling mode while a user’s preference towards energy conservation or quiet corresponds to the Passive cooling mode. ACPI defines an interface to convey the cooling mode to the platform. Active cooling can be performed with minimal OSPM thermal policy intervention. For example, the platform indicates through thermal zone parameters that crossing a thermal trip point requires a fan to be turned on. Passive cooling requires OSPM thermal policy to manipulate device interfaces that reduce performance to reduce thermal zone temperature. Either cooling mode will be activated only when the thermal condition requires it. When the thermal zone is at an optimal temperature level where it does not warrant any cooling, both modes result in a system operating at its maximum potential with all fans turned off. Thermal zones supporting the Set Cooling Policy interface allow the user to switch the system’s cooling mode emphasis. See Section 11.4.11, “_SCP,” for more information. Active Cooling Thresholds (_ACx) 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 Passive Cooling Threshold (_PSV) Figure 11-62 Active and Passive Threshold Values As illustrated in Figure 11-62, the platform must convey the value for each threshold to instruct OSPM to initiate the cooling policies at the desired target temperatures. The platform can emphasize active or passive cooling modes by assigning different threshold values. Generally, if _ACx is set lower than _PSV, then the system emphasizes active cooling. Conversely, if _PSV is set lower than _ACx, then the emphasis is placed on passive cooling. For example, a thermal zone that includes a processor and one single-speed fan may use _PSV to indicate the temperature value at which OSPM would enable passive cooling and _AC0 to indicate the temperature at which the fan would be turned on. If the value of _PSV is less than _AC0 then the Hewlett-Packard/Intel/Microsoft/Phoenix/Toshiba 527
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FACP - Flag Bit Length Advanced Con
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MEMORY_POWER _STATUS_REGIST ER Adva
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Table 5-87 Flag format Advanced Con
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Table 5-93 Socket Structure Advance
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Root R \_PR P \PID0 \_SB d CPU0 _ST
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Hex value Description Advanced Conf
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Arguments: (1) Advanced Configurati
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5.7.5 _DLM (DeviceLock Mutex) Advan
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Return Value: None Advanced Configu
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6.1.2 _CID (Compatible ID) Advanced
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Device(BUS0) { } Advanced Configura
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Example: Advanced Configuration and
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Status Code Description 0xA0-0xFFFF
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Arguments: None Return Value: Advan
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Offset Field Name Advanced Configur
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Byte 3 Interrupt Vector Flags Advan
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Byte 11 Byte 12 Byte 13 Byte 14 Adv
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6.5.7 _GLK (Global Lock) Advanced C
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8.4 Declaring Processors Advanced C
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} Advanced Configuration and Power
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Example Advanced Configuration and
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Element Object Type Counter Wraparo
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} }) Advanced Configuration and Pow
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8.5.2 OSPM _OST Evaluation Advanced
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} } } }) Advanced Configuration and
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13.1.3 SMBus Status Codes Advanced
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OperationRegion (� RegionName, //
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16.1 Sleeping States Advanced Confi
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Result // Target� ) => Integer Ad
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) DebugTerm :=� Debug Advanced Co
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) Advanced Configuration and Power
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Result // Target� ) => Advanced
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Transfer8 | Transfer16 | Transfer8_
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EISAID FromBCD ToBCD Advanced Confi
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To convert from an object of this D
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Name (CNT, 5) Store (CNT, Local0) A
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DefSleep := SleepOp MsecTime SleepO
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Encoding Value Advanced Configurati
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\ S0 S1 MEM MEM CPU SET GET SET GET
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Primary Desktop Secondary Desktop T
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primary terms 678 reserved object n
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Case (Conditional Execution) 728 ca
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D1 Device State definition 27 trans
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EFI definition 19 GetMemoryMap inte
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definition 20 events 20 registers 2
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hung systems 75, 76 hysteresis 522
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Notification Temperature Threshold
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implementation requirements 10 pass
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performance states 43 performance v
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estoring system context 619 results
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commands, restricted 580 data buffe
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throttling 387, 400 THT_EN 90 Timer
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