I've installed OpenSolaris on a new system with an Abit IP35Pro motherboard that employs the Intel ICH9R which is configured in AHCI mode. The installation completed without error, but I've seen multiple instances where the machine hangs on shutdown. The shutdown proceeds to the point where it displays a message about syncing the disk or filesystem (sorry, I'm doing this from memory--should have taken better notes), and I think that sync completes, but then the cursor moves to the next line and sits there blinking. I've just powered it off after 5 minutes or so and then it booted normally, but then it also failed to boot once indicating that it couldn't run fsck on the file system containing the root.
I've tried using partitions on a single drive, and using the entire drive and got the same results. Any ideas?