dl580g3/amd64: [ACPI] 6.0-RELEASE will not boot with ACPI enabled

[paketix at bluewin.ch]

if booted with 6.0-RELEASE (amd64) the system hangs
if booted with 5.4-RELEASE (amd64) the system boots just fine
disabling acpi on 6.0-RELEASE helps but it seems that using SMP will not
be possible after that
it seems to be an issue related to the pci cards - if if remove all cards
the system boots well using 6.0-RELEASE

please find all the logs (boot -v; sysctl; acpidump) at
http://mypage.bluewin.ch/poe/

system description:
hp dl580g3
dual proc xeon 3ghz
4gb ram
smart array 6i
5 fiber optic dual port pci-x cards (intel)
1 rj45 quad port pci-x card (intel)

please let me know if further information/patch-testing is needed
local access to the machines is possible until mid of january - one machine
runs 5.4-RELEASE the other one 6.0-RELEASE
hope somebody has the time to have a look at it

regards, pat