I've asked a few questions related to this subject, because I could not use Ubuntu when my ACPI was alway enabled. I discovered how to install everything with ACPI off and Ubuntu is working now decently.
My question now is - is it dangerous to run Ubuntu with ACPI = off? That's the only way I can use it, at least versions like Ubuntu 14 and 16, and I want to know if using those operating systems with ACPI off would be dangerous for my computer.
Keeping ACPI off isn't necessarily dangerous. The biggest issues are:
If you're on a laptop then I don't recommend disabling ACPI at all, for obvious reasons.
If you're on a desktop then there isn't an inherent danger to keeping ACPI off. Some components such as your SSD or CPU may have their lifetimes impacted, but not by noticeable amounts. Again, the biggest issues on a desktop are power consumption.
I recommend testing out disabling ACPI. Delete the acpi=off parameter from the Ubuntu kernel params at boot and see what happens (remember, editing the GRUB parameters is temporary). If you can, I advise leaving ACPI on.
