port-amd64/45118: -current boot failure of smp Dell C521

[cyber%netbsd.org@localhost]

>Number:         45118
>Category:       port-amd64
>Synopsis:       -current boot failure of smp Dell C521
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jul 04 23:20:00 +0000 2011
>Originator:     Erik Berls
>Release:        -current July 4, 2011 14:30 PDT
>Organization:
NetBSD
>Environment:
NetBSD dev0 5.99.54 NetBSD 5.99.54 (GENERIC) #0: Mon Jul  4 07:57:10 PDT 2011  
cyber@dev0:/n/srv0/Src/N-current/src/sys/arch/amd64/compile/obj/GENERIC amd64

(Ignore build timestamp, clock is set wrong.)
>Description:
In trying to debug bge issues, issues were discovered with -current.

This is running on a Dell Dimension C521 (2 core, 2G ram), with an BGE 5701, 
and an HDMI output based vga card installed.

GENERIC, Source update as of July 4, 2011 14:30 PDT:
- booted normally hangs in autoconf after acpicpu1 line
- booted with -12c & 'disable azalia' gets to multi user
- booted with -1 gets to multi user
- booted with -2 hangs after audio0 at hdafg4



This system functions correctly with SMP (modulo issues with high nfs load) on 
5.0.2, bge fails to communicate on 5.1 & netbsd-5.
(ref kern/44897)

dmesgs available upon request

>How-To-Repeat:
boot -current without flags

>Fix: