Knowledge Base:Disabling ACPI support at boot time

Synopsis
When boot failures occur, it is sometimes recommended to disable ACPI support to verify if the ACPI support is indeed the reason for the malfunction. This will cause the entire system to run without ACPI support so power management functions will not work well.

Environment
Gentoo Linux systems with ACPI support enabled:

Analysis
When ACPI support is built in the Linux kernel, users can pass a boot option to disable ACPI support in the Linux kernel for that boot.

Resolution
During bootup, edit the boot line in the boot loader and add the  boot option to the kernel line, and then boot this entry. This will cause ACPI support to be disabled for this single boot session. If you want to make this permanent, either edit the boot loader configuration or remove ACPI support from the Linux kernel configuration.