yes! I have psb up on Fedora 10. I just had it driving the P’s internal panel at 1600×768 and my 20″ monitor at 1680×1050 – 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…)