yes! I have psb up on Fedora 10. I just had it driving the P's internal panel at 1600x768 and my 20" monitor at 1680x1050 - side-by-side. which is actually pretty impressive. It has a decent RandR implementation.
Details and packages to come, I'm still twiddling with some bits (like why it doesn't work unless I pretend I only have 512MB of RAM...)