kern/43220: NETSD 5.1_RC1 doesn't boot with ACPI enabled

[stadtkind2%gmx.de@localhost]

>Number:         43220
>Category:       kern
>Synopsis:       NETSD 5.1_RC1 doesn't boot with ACPI enabled
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Apr 28 22:10:00 +0000 2010
>Originator:     Stefan Krueger
>Release:        
>Organization:
>Environment:
NetBSD 5.1_RC1 (INSTALL) #0: Sun Apr 25 06:21:35 UTC 2010 
builds%b7.netbsd.org@localhost:/home/builds/ab/netbsd-5/amd64/201004250000Z-obj/home/builds/ab/netbsd-5/src/sys/arch/amd64/compile/INSTALL
>Description:
NetBSD 5.1_RC1 amd64 install cd hangs when booting with ACPI enabled, here is 
the dmesg (I'm not getting past "ahcisata0 port 2: device present, speed: 
3.0Gb/s"):

http://dpaste.org/W6Bu/

Board is a Asus M3A78-EM, see 
http://www.asus.com/Product.aspx?P_ID=KjpYqzmAd9vsTM2D

I get to the installation screen when I disable ACPI in the boot menu though..
>How-To-Repeat:

>Fix: