https://bugs.freedesktop.org/show_bug.cgi?id=28342
--- Comment #12 from Marc marvin24@gmx.de 2010-06-02 14:28:00 PDT --- here it crashes hard as soon as X starts, no dmesg available. plymouth renders something to the framebuffer during boot process. Not all distros are using this (I know of Ubuntu and Fedora).
Magnus: can you try with tiling patches in kernel + mesa, but without patched ddx?