After searching a little bit more, I found bug #314566. I don't have 2 cards, but 2 monitors (laptop internal display and external monitor). Beside this I have exactly the same problems like described in bug #314566.
-- [Karmic] Xserver does not detect keyboard and mouse when started trough KDM https://bugs.launchpad.net/bugs/426113 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs