What does BSOD 165 (ACPI_BIOS_ERROR) mean?

 
Previous Next
CNSS_FILE_SYSTEM_FILTER FP_EMULATION_ERROR

ACPI_BIOS_ERROR

ACPI_BIOS_ERROR meaning

ACPI_BIOS_ERROR is bug check 0x000000A5. Windows found that the firmware ACPI implementation is not compliant enough for the operation being performed. Parameter 1 selects the incompatibility class, and the remaining parameters describe the affected table, resource, namespace object, or ACPI method.

How to analyze ACPI_BIOS_ERROR

Start with Parameter 1 and the exact firmware revision. Save the ACPI tables, BIOS/UEFI version, platform model, and the stack or setup phase in which the failure occurred. Compare the installed firmware with the system vendor release notes rather than applying generic driver changes.

  • Preserve the complete dump, all four parameters, Windows build, loaded modules, and the event timeline before changing drivers or firmware while investigating ACPI_BIOS_ERROR.
  • Run !analyze -v and follow the parameter-specific objects and the stack associated with ACPI_BIOS_ERROR rather than relying only on the symbolic name or a single probable-cause line.
  • Compare multiple dumps when available; a stable instruction or object path associated with ACPI_BIOS_ERROR is stronger evidence than a module that appears only after earlier corruption.

Recovery boundary for ACPI_BIOS_ERROR

Update firmware only through the platform vendor workflow. If no compliant firmware exists, the durable fix belongs to the firmware or platform configuration; disabling ACPI is a legacy setup workaround and is not a normal recovery strategy for current systems.

Official references for ACPI_BIOS_ERROR

Looking for a different code? Search another status or error code.