Comment 225 for bug 1776563

Let me preface this by saying that I'm mainly a windows user, and (unluckily) the first time I am running linux on hardware is my Acer A315-41 so take that as you will.

Here's what happened with me:
- I initially used "pci=noacpi" to install ubuntu, and it was running as you might expect from the comments here (hang on suspend, brightness buttons not working).
- After I found this page, I tried "ivrs_ioapic[4]=00:14.0 ivrs_ioapic[5]=00:00.2" and the performance was significantly worse - the laptop heated noticeably in idle and the battery drained really fast. I could now use the brightness keys, but the screen was stuck on max brightness and it did not change.
- Finally I reverted back to "pci=noacpi", and it looks better. According to Power Statistics battery drain is about 12W in idle, and when I ran a stress test it got up to 21W so there is some kind of power management going on. The strangest thing is that even though I reverted the parameters back, I can no longer change the screen brightness at all (the default slider from power management is gone, "brightness controller" I downloaded does nothing, f.lux does not work)

At this point i may reinstall ubuntu and keep it at noacpi or switch to fedora and see if it really works