so the driver starts with the maximized window and its not possible to minimize/iconify it. This is truly not a nice behaviour of the driver and shouldn't be the case.
We have experienced kind of a similar thing on RedHat 5, where the driver starts maximized, too. But here its possible to iconify.
I'll see, if I can reproduce this issue here in our lab and let you know (I'm back in the office again on Monday)!
Can you please try what happens, if you use Gnome as desktop instead?