Comment 1 for bug 192823

Workaround for same error, different hardware.

System boots properly with the boot time option -B user-acpi-options=0x8
Also work with the boot time option set to -B user-acpi-options=0x2

This can be done first from grub by pressing 'e' at boot twice.
Then editing the contents of /boot/grub/menu.lst from
kernel$ /platform/i86pc/kernel/$ISADIR/unix -B $ZFS-BOOTFS

to (Note the comma):

kernel$ /platform/i86pc/kernel/$ISADIR/unix -B $ZFS-BOOTFS,user-acpi-options=0x2

This can be set more permanently by editing /boot/grub/menu.lst to include the ",user-acpi-options=0x2"
then doing the following:

mv /boot/solaris/boot_archive /boot/solaris/boot_archive.orig
bootadm update-archive

Workaround derived from information at:
Dana H. Myers's Weblog
Configuring Solaris ACPI at boot-time
http://blogs.sun.com/danasblog/entry/configuring_solaris_acpi_at_boot