mpt irq timeout problem after reboot - only if non-verbose booting !?!

[Harald Schmalzbauer]

 Hello,

I have 9.1-RC2 running in an ESXi 5.1 guest.
I use 'lsisas' as virtual SCSI-Controller and mpt attaches and finds 1068E.

Everything is working fine until the first 'shutdown -r now':
The second boot pauses for ~2 minutes after probing disks and continues
with this error:
mpt0: Timedout requests already complete. Interrupts may not be functioning.

This problem was also obeserved with real 1068 hardware:
http://lists.freebsd.org/pipermail/freebsd-stable/2011-September/063937.html

When I power off the virtual machine instead of rebooting, the problem
doesn't occur.

Accidentally I found a workarround ;-) :
If I set 'verbose_boot' in loader.conf, the problem vanisehs!?!?!?

Any idea how „verbose_boot“ affects the operation of the mpt driver?

Thanks,

-Harry
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