This procedure describes how to access the ACPI parameter from the BIOS Setup utility for the Sun Blade X8400, X8420, and X8440 Server Modules.
From the Advanced menu, select ACPI Configuration and press the Enter key.
A popup window appears.
Select ACPI Aware OS and press the Enter key.
A popup window appears.
From the Options popup menu, select Yes and press the Enter key.
Select Advanced ACPI Configuration, then press the Enter key.