i'm trying to understand the sax2 tool

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http://forums.opensuse.org – I'm switching between nv driver to nouveau. Now the command sax2 -a -m 0 X=nouveau, the syntax might be correct. If so, I still don't really understand the -m switch. When I man sax2, it said card X=module, what is card stand for, 0 meaning the first card and so on. X means X as short for XORG. A bit more explanation would be great (Distributions)