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STATUS_ACPI_INVALID_OPCODE
STATUS_ACPI_INVALID_OPCODE is raised while the ACPI AML interpreter is decoding a control method or definition block. AML is the bytecode used to populate and evaluate the ACPI namespace; an opcode at the current byte-stream position is not valid in that grammar. This is therefore evidence about firmware-supplied ACPI data, not a report that an ordinary user-mode program executed an illegal CPU instruction.
The useful distinction is between an invalid AML opcode and STATUS_ACPI_INVALID_TABLE. The former concerns decoding inside a table that reached the AML interpreter; the latter concerns selection or validation of a table as a table. A device-driver setting rarely changes either condition.
An AML decoding failure, not an application instruction fault
- Record the ACPI method name or table identifier reported near the failure, together with the OEM ID, OEM table ID and revision.
- Determine whether the same firmware build reproduces the failure before and after a cold boot, sleep transition or firmware update.
- When analysing a dump or firmware image, examine the affected DSDT or SSDT with an AML-aware decoder rather than editing byte offsets blindly.
References
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