I could not find any BIOS updates to Acer M1641. Therefore I have to use "acpi=off pnpbios=off" option. There was still a problem. Reboot works. Shutdown does not work as it hangs.
Similar bugs were reported for Ubuntu 8.04.
1) https://bugs.launchpad.net/ubuntu/+bug/193125
2) http://ubuntuforums.org/showthread.php?t=699506
3) http://ubuntuforums.org/showthread.php?t=698972
The solution in the Launchpad bug report works.
This is certainly not an old PC and Vista 32bit SP1 works fine. However I tend to believe this is more an Acer Bios bug. Actually FreeBSD 7 hangs during startup. If I disabled ACPI in BIOS, FreeBSD 7 will complain about GPF (General Protection Fault) no matter which option I select for startup. If I enable ACPI in BIOS, it could not find the disk. So I could not run FreeBSD 7 at all with this new PC. So Ubuntu 8.04 is at least better than FreeBSD 7 in this aspect.
FreeBSD problem with Acer M1641 is reported here.
http://unix.derkeiler.com/Mailing-Lists/FreeBSD/questions/2008-08/msg00806.html
Notes on 10-April-2009:
The latest kernel does not need the options any more for Ubuntu 8.04.
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