https://bugs.freedesktop.org/show_bug.cgi?id=53490
--- Comment #5 from Joeri Capens joeri@capens.net 2012-08-15 00:18:56 UTC --- Adding Xorg.0.log. I tried the latest Mesa Git now but it didn't make a difference.
However, I found the specific change in 416a2bd274566a6f607a271f524b2dc0b84d9106 which causes the bump map corruption I'm seeing. When I revert the change in the tile_config calculation, the problem goes away.
I've created a patch which fixes the tile_config calculation and which removes the unused num_shader_engines variable.