https://bugs.freedesktop.org/show_bug.cgi?id=36236
--- Comment #3 from dcelasun@gmail.com 2011-04-14 13:28:46 PDT --- The quote the game developer's post over at Phoronix:
The lights are missing. Which means that deferred phase is not working. Which means that most likely G-buffers are not filled correctly because multiple render targets do not work. This should probably be filed as a bug against the driver.