To expand a little on my thoughts, expressed in the comments above:
Questions related to ACPI (Advanced Configuration and Power Interface) warnings on boot are in fact in over supply on Ask Ubuntu. Thanks to @Esther for some keen detective work in not only seeing the trend but also in documenting the trend so exactly! And thanks as well to @Artur Meinild for getting things moving along!
My own view of the ACPI warnings is that there are three general classes of answers that could be given, with one answer being the most usually acceptable (hint: it is the number 1 bullet point!):
- Benign warnings which can be safely ignored: BIOS / UEFI developers have not followed the exact ACPI specifications that Linux tests for and a warning is issued; often unfortunately labelled as an error. 95% of these warnings can be safely ignored.
- BIOS updates and/or adjustments required: In rare cases an updated BIOS may address the errors and perhaps in some cases some small changes in the existing BIOS settings may be required to address the warnings. Keeping in mind the target audience on AU and the very real possibility of bricking the computer with a bad BIOS flash I would suspect that advice of this sort would be issued sparingly and with considerable warnings. (I would think the same caveats would apply to updating the Kernel in a bid to escape ACPI warnings.)
- Turn ACPI off via grub: This would general be a 'Bad Idea™' as this would open the door to many applications and services that use ACPI not functioning at all. Heating and hardware issues are addressed here on AU where it can be seen that while it can be done it is not a great idea.
On my look through Ask Ubuntu the question and answer that I found that seemed to address the safest course was this:
And after the required discussion on this Meta thread I would suggest that this would be a reasonable canonical thread with which to close as Duplicates most (not all) of the many other ACPI error threads.
But I am more than prepared for this and all the points raised in this answer to be robustly debated and/or challenged before a wholesale set of Duplicates are created!
Edit: I have closed some as Duplicates and I see the Community has sorted out the rest...