Solaris on a laptop CAN be done, but be prepared for a long hard struggle.
It seems that the difficulties with some laptops are near insuperable, so it depends on what laptop you have. Solaris, true to it's orgins, only understands a limited range of hardware.
Google for "solaris laptop" - lots of hits -
http://www.bolthole.com/solaris/x86-laptops.html is a starter.
I got Solaris booting successfully on an Intel-based x86 desktop and then, I confess, lost interest.
Good luck!
