I got this acpi error at the time of installation and booting of my new Hardy Heron in my laptop. This problem usually occurs for laptop users. Anyway, Hardy Heron (stable version, release 0 ) is using 2.6.24 kernel, and this was a complete bug for 2.6.23 and this is partially solved in 2.6.24. I faced this error in my Vaio laptop. So, if you get that error, you can solve that like this [0] way.
[0] http://mohibuzzaman.googlepages.com/hardyheron Enjoy hardy heron!! -- Best, Z [Non-text portions of this message have been removed]
