https://bugs.freedesktop.org/show_bug.cgi?id=30148
--- Comment #1 from Alex Deucher agd5f@yahoo.com 2010-09-12 15:42:43 PDT --- You are probably missing the rlc ucode which is available in the linux-firmware tree or here: http://people.freedesktop.org/~agd5f/radeon_ucode/