Comment 57 for bug 160763

@mrrusof, sure acpi brightness works correctly with this, but yet, it is still badly broken
see my post about this:
http://www.nabble.com/Mess-with-hardware-brightness-keys-td23244488.html

I nowadays just use acer-wmi, since it works.

@Enrico Gueli, there is no such driver, or it is included by default in vista.

I didn't like default language, and thus reinstalled vista from clean disk.
I did then install 'drivers', but only very minimal subset of them (althought I did install their video drivers, you know, maybe I do need to reinstall vista, and see how it works without anything added)

As for state reset, it isn't easy. just look at /proc/iomem

7fcfd000-7fd07fff : reserved
7fd08000-7fd51fff : System RAM
7fd52000-7fd54fff : reserved
7fd55000-7fdbafff : System RAM
7fdbb000-7fdbefff : reserved
7fdbf000-7fe6ffff : System RAM
7fe70000-7febefff : ACPI Non-volatile Storage
7febf000-7fefffff : ACPI Tables
7ff00000-7fffffff : reserved

as you see these regions are reserved for bios, and they aren't small. It is a good idea, to try to resote 'em, and you know, I give it another try. don't hold your breath though, I already did plenty of things like that, and nothing seems to help