Either using OpenGL or some Linux voodoo, how can I obtain the total amount of video memory for an ATI card?
did you try this OGL extension:
That extension only provides information about free memory not total memory. It is missing a TOTAL_MEMORY_ATI define in my opinion. Does AMD_performance_monitor return the value and if so what is the name of the counter?
try this extension http://www.opengl.org/registry/specs/AMD/wgl_gpu_association.txt
and maybe ADL SDK.