Comment 23 for bug 434361

I have a similar problem to the one Harry has (comment #7): When I boot up Karmic (Alpha 6 and daily-live 2009-09-28), everything goes fine, but instead of gdm showing up, I get a black screen. When I hit any key, I see tty1. Not logging in, just pressing Control+Alt+F7 starts gdm and I can normally login without a problem. My graphics card is an Ati RS482 [Radeon Xpress 200M], no proprietary driver.
Any more information, I can provide?