https://bugs.freedesktop.org/show_bug.cgi?id=87856
--- Comment #12 from Alex Perez aperez@alexperez.com --- I can confirm that the driver fails with no error here as well, on an e5500-based ppc64 system. Everything works (with acceleration) when depth is set to 16 bits. I know a handful of other people who have had the same problem on 32-bit ppc hardware (modern, non-macppc), so we can be reasonably confident that this is a broad ppc-specific issue (possibly be/byte-swapping related?)