ACPI 4.0a has been published. This revision includes errata corrections and clarifications and can be downloaded from: http://www.acpi.info/spec.htm Revision Change Description Affected Sections 4.0a Apr. 2010 Errata corrected and clarifications added. Removed text concerning government requirement of mechanical off Clarified URL update document, Corrected section references for APIC, SLIT, SRAT in Table 5-5, Update URLs and reformatted Table 5-6 Corrected reference to Interrupt Source Override Structure Corrected name for CPEP table Corrected reference to SMBus, should be IPMI Clarified BusCheck and DeviceCheck notifications in Table 5-53 Added link to non-ACPI Plug and Play ID reference document Added missing _ATT and _GAI names, Corrected page/section references in Table 5-67 Corrected EndTag name value. Was 0x78, correct value is 0x79 Table 6-33 Consumer/Producer bit is ignored (Restored 2.0C change that had been lost) Clarified use of _GLK (Global Lock) object Corrected definition of _TSD object Corrected definition of _PSD object Corrected table name (CPEP) Corrected "maximum positive adjustment" value. Was 500%, correct value is 50%, Updated description of example - 300 to 400 lux, Eliminated hardcoded package lengths in examples, Changed "brightness" to "highest ambient light value" Corrected reference to _IDE, should be _GTM. Corrected table reference Clarified GPE Block Device Description Corrected _PLD object examples Repaired diagram that would not display properly Figure 10-2 Added missing _BCT method to Table 10-3 Clarified that OEM Information field should contain NULL string if not supported in Table 10-4 &Table 10-5 Corrected description of _BTM arguments and return value Clarified description of _BCT return value Corrected HID for Power Source device. Was ACPI0003, correct value is ACPI0004 Corrected _PIF example. First package element was a Buffer, should be Integer, Clarified that OEM Information field should contain NULL string if not supported Table 10-10 Corrected description of _SHL method Table 10-11 Clarified _PRL return value, a list of References Corrected _PMC example. First package element was a Buffer, should be Integer Clarified that OEM Information field should contain NULL string if not supported Table 10-12 Removed "TODO" note. Updated example Repaired diagram that would not display properly Figure 15-1 Corrected error conditions from "fatal" to "corrected Corrected several incorrect section references, Clarified number of Generic Error Data Entry structures is >=1 (not Zero) Clarified number of Generic Error Data Entry structures is >=1 (not Zero) Added new section clarifying SCI notification for generic error sources Added new section describing Firmware First error handling Clarified purpose of the codes Table 17-17 Added reference to table of COMMAND_STATUS codes Table 17-23 Clarified purpose of the command status codes in Table 17-27 and the error type definitions in Table 17-28 Added _ATT resource descriptor field name Clarified rules for Buffer vs. Integer return types from a field unit Corrected section/page reference 2.2 5.2.6 5.2.12.4 5.2.18 5.5.2.4.3.1 5.6.5 5.6.6 5.6.7 6.4.2.8 6.4.3.5.1,2,3 6.5.7 8.4.3.4 8.4.4.5 8.4.5 9.2.5 9.8.2.1.1 9.10 9.13 10.1.3.1 10.2.2 10.2.1.1-2 10.2.2.8 10.2.2.9 10.3 10.3.3 10.4 10.3.4 10.4.1 10.4.1 10.5 15.1 17.1 17.3.1 17.3.2.6.1 17.3.2.6.2 17.4 17.5.1.1 17.6.1 17.6.3 18.1.8 18.5.44,89 18.5.101