> It did not seem to produce any more messages with
> this flag turned on.

Did you reboot after changing the /etc/system file?


> This is what I gotten on the console:
> dbus failure unregistering from session: Did not receive a reply..
> .....
> mount point </.alt.b119> is busy.
> ... failed to propagate grub menu...

The above could yet another issue,
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6844989


> sync filesystem....done
> 
> Then the computer hangs, and the power button like
> turned yellow instead of the regular blue. The only
> way to power off the machine is to hold the button.

Hmm, I suspect the change in color for the power led
is because the function acpi_poweroff() is calling into
acpi bios to prepare for the system to power off.

Strange that there is no more output after 
"syncing file systems... done". Sounds as if it
is hanging before we get to acpi_poweroff() ?


>From the text console, can you try to enter the
kernel debugger, set a breakpoint in acpi_poweroff
and poweroff the machine?

    # mdb -K
    [0]> acpi_poweroff:b
    [0]> :c
    # poweroff


Does that stop in kmdb at the acpi_poweroff breakpoint?
Or does it hang?
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