Ubuntu
linux package

  1. Bug #1933707
  2. Comment #2

Comment 2 for bug 1933707

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Alex Hung (alexhung) wrote :

There are two types of ACPI errors: AE_NOT_FOUND and AE_ALREADY_EXISTS, and both of them are the result of BIOS bugs

AE_NOT_FOUND: BIOS declares but does not defines them, and accessing them generates failures - this includes both USB port and touchpad declaration.

AE_ALREADY_EXISTS: BIOS defines the same variables twice and kernel complains when it parses the second one.

These must be fixed in BIOS so you need to report to Acer, and nothing can be done in Linux kernel. Having say that, these BIOS code can be for dummy devices. If you aren't seeing USB ports and touch failures, they can be safely ignored.