xf86MapVidMem: Could not mmap /dev/vga (Invalid argument). What is this?

[Максим Голунов]

Please, help. I know that configurated X11. My videoCard is GeForce 8600.
But I can`t starting X. File-log attach to this letter. I`m undestending than problem in phrase

xf86MapVidMem: Could not mmap /dev/vga (Invalid argument) 

but I don`t know this is mean.
What I need do?  I have enough deep knowledge in FreeBSD.

Thank you very much.
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