I seem to have the same problem. Running with KMS enabled + "edgers" xorg.
With kernel 2.6.30-8 I get the ubuntu logo at startup, then black screen, then the screen reappears at GDM login prompt.
With kernel 2.6.30-9 I get the ubuntu logo at startup, then black screen, then the computer seems to continue working for a while but the screen remains black.
I seem to have the same problem. Running with KMS enabled + "edgers" xorg.
With kernel 2.6.30-8 I get the ubuntu logo at startup, then black screen, then the screen reappears at GDM login prompt.
With kernel 2.6.30-9 I get the ubuntu logo at startup, then black screen, then the computer seems to continue working for a while but the screen remains black.