Have you ever tried it?
The last four laptops I installed OpenSolaris on all had Zero problems with the Device detection tool. I am not talking about the servers - they all run perfectly now. (my Nexenta test installation did not recognize the built-in NIC, so I had to use an add-on; oSol snv-117 recognized both, interestingly enough - they were using the same chipset - rge). And all that is on reasonably new hardware - Asus P6T m/b, Core i7 920 etc. OK, the built-in Intel RAID wouldn't work, but even if it did, it should *not* be used... ZFS works best with JBODs.
As long as you follow /dev you are allright.