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What does “acpi=off” do in Ubuntu boot and is it harmful?

Ubuntu 6

The Advanced Configuration and Power Interface (ACPI) is an integral part of any computer system. It is responsible for power management and hardware configuration, among other things. In this article, we will explore what happens when you disable ACPI using the acpi=off command in Ubuntu boot and whether it is harmful or not.

Quick Answer

Disabling ACPI using the acpi=off command in Ubuntu boot temporarily disables ACPI functionality, but it does not harm the computer. However, it is not recommended as a long-term solution as it prevents power management features from functioning properly. It is advisable to explore alternative options to ensure proper functionality.

Understanding ACPI

ACPI is a standard that allows operating systems to control the power-saving aspects of the underlying hardware. This includes actions such as putting the computer to sleep, waking it up, and many other power-related tasks. It is a crucial feature for laptops where power management can greatly affect battery life.

The Role of “acpi=off” in Ubuntu Boot

The acpi=off command is a kernel boot parameter in Ubuntu that disables the ACPI feature. This command is used when the computer’s ACPI is not compatible with the version of Ubuntu being used. This incompatibility can lead to various issues, such as a black screen or non-functioning wireless.

The acpi=off command is usually added to the end of the linux line in the GRUB bootloader. For example:

linux /boot/vmlinuz-3.13.0-29-generic root=UUID=bc6f8146-1523-46a6-8b\
6a-64b819ccf2b7 ro quiet splash acpi=off $vt_handoff

In this command, acpi=off tells the kernel to ignore all ACPI functionality.

Is “acpi=off” Harmful?

Using acpi=off does not damage or harm the computer. It only disables ACPI temporarily during boot. However, it is not an ideal solution as it prevents the computer from suspending when the lid is closed, among other power management features.

Alternative Options

Instead of adding the acpi=off parameter every time during boot, there are alternative options. One option is to disable the new card or ACPI from the BIOS. However, disabling ACPI from the BIOS may cause issues with Windows and may require reinstalling it, so it should only be done if there is a hidden Windows recovery partition on the computer.

In another context, the acpi=off parameter was replaced with pci=noacpi to resolve booting issues. The recommended approach is to cycle through different options such as nolapic, noapic, acpi_osi=“Linuxâ€, acpi_osi=“Windows 2006â€, acpi=ht, pci=noacpi, acpi=noirq, and pnpacpi=off to find the one that works. Once the appropriate option is found, it can be added to the GRUB_CMDLINE_LINUX_DEFAULT line in the /etc/default/grub file.

For example:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pci=noacpi"

In a different scenario, disabling ACPI without any alternative options was the only stable solution for a Sony laptop running Ubuntu 20.04. However, it resulted in the touchpad being disabled as well.

Conclusion

In conclusion, using acpi=off temporarily disables ACPI during boot and does not harm the computer. However, it is recommended to explore alternative options and find the most suitable one to ensure proper functionality. Remember, ACPI is an important feature for power management and hardware configuration, so it’s best to have it enabled whenever possible.

What happens if I disable ACPI using `acpi=off` in Ubuntu boot?

Disabling ACPI using acpi=off in Ubuntu boot temporarily turns off ACPI functionality during boot. This can help resolve compatibility issues with the version of Ubuntu being used, but it also disables power management features such as suspending when the lid is closed.

Is using `acpi=off` harmful to my computer?

No, using acpi=off does not harm your computer. It only disables ACPI temporarily during boot. However, it is not an ideal solution as it disables important power management features.

What are the alternative options to using `acpi=off`?

Instead of using acpi=off, you can try alternative options such as pci=noacpi, nolapic, noapic, acpi_osi=“Linux”, acpi_osi=“Windows 2006”, acpi=ht, acpi=noirq, and pnpacpi=off. These options can be added to the GRUB_CMDLINE_LINUX_DEFAULT line in the /etc/default/grub file.

How do I add the `acpi=off` parameter to the GRUB bootloader?

To add the acpi=off parameter to the GRUB bootloader, you need to edit the GRUB configuration file. Open the file /etc/default/grub in a text editor, find the line starting with GRUB_CMDLINE_LINUX_DEFAULT, and add acpi=off within the double quotes. Save the file and run sudo update-grub to apply the changes.

Can disabling ACPI cause issues with other operating systems?

Disabling ACPI can cause issues with other operating systems, especially Windows. If you have a hidden Windows recovery partition on your computer, disabling ACPI from the BIOS may lead to problems and may require reinstalling Windows. It is important to consider the potential impact on other operating systems before disabling ACPI.

Is there a recommended approach to finding the alternative option that works for my system?

Yes, there is a recommended approach. You can cycle through different options such as pci=noacpi, nolapic, noapic, acpi_osi=“Linux”, acpi_osi=“Windows 2006”, acpi=ht, acpi=noirq, and pnpacpi=off to find the one that works for your system. Once you find the appropriate option, add it to the GRUB_CMDLINE_LINUX_DEFAULT line in the /etc/default/grub file.

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