https://bugs.freedesktop.org/show_bug.cgi?id=35446
--- Comment #1 from Marek Olšák maraeo@gmail.com 2011-03-19 05:41:01 PDT --- When the CS space validation fails, it means there is not enough space either in the video memory or in the GPU-accessible system memory.
How many bits per pixel does the texture have? 4096x4096 is the maximum hardware limit. Any larger texture is not loaded and OpenGL will return an error to the application (but Blender seems to ignore it), and can draw either a black or white color instead.
Please post the output of:
RADEON_DEBUG=info glxgears
I am interested in the lines beginning with "r300:"