F18: Toshiba AMD Radeon not supported?

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http://forums.fedoraforum.org – Hello, I've been trying to install F18 on a Toshiba C870. It has AMD Radeon HD 6625M Graphics on board, which doesn't seem to be supported by the radeon driver included in F18. It is also not supported by the closed source Catalyst drivers (as per the AMD website compatibility list). When I boot normally, all it shows is a black screen. When I remove the "rhgb quiet" from the grub commandline, I can vaguely see the boot information in the top few pixel lines of the screen (i.e. lots of white dots and some green dots which I think represent the OK in the boot messages). If I (HowTos)