![]() ![]() It will be necessary to press/hold the shutdown/reboot button of that server, power off via Out-of-Band management or use some other external device (e.g. The consequences are that when ACPI is off, the server will be unable to turn itself off, as the soft shutdown cannot work after executing poweroff or shutdown -h now. If the machine is randomly powering off or failing to boot, disabling ACPI may help. However, many hardware platforms ship with buggy or out-of-specification ACPI firmware which can cause any number of unspecified problems. This also comes from the hardware design. For example, a device cannot be running in full-power "behind" a device that is sleeping or in stand-by mode. ![]() Note: some machines are able to boot without using ACPIĪCPI power-saving features are hierarchical, meaning that any device running "behind" another will be dependent on the power state of the parent device. It is the system that describes hardware to the operating system to let understand what hardware is present and to properly configure it, controls hardware actions such as the dynamic speed fans, the power button behavior, system sleep states, optionally to control frequencies of CPUs and helps to identify some system capabilities. What are the acpi and noapic kernel boot options?ĪCPI stands for Advanced Configuration and Power Interface.
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