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From: John Hein <jhein@symmetricom.com>
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Cc: freebsd-x11@freebsd.org
Subject: Re: xf86MapVidMem: Could not mmap /dev/vga (Invalid argument). What
	is this?
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$,1(<(P(Z(a(X(\(B $,1(3(^([(c(](^(R(B wrote at 20:53 +0400 on May  4, 2011:
 > Please, help. I know that configurated X11. My videoCard is GeForce 8600.
 > But I can`t starting X. File-log,A (Battach to this letter. I`m undestending than problem in,A (Bphrase
 > 
 > xf86MapVidMem: Could not mmap /dev/vga (Invalid argument),A (B
 > 
 > but I don`t know this is mean.
 > What I need do? ,A (BI have enough deep knowledge in FreeBSD.
 > 
 > Thank you very much.
 > [DELETED ATTACHMENT Xorg.0.log_NV, application/octet-stream]
 > [DELETED ATTACHMENT xorg.conf.new, application/octet-stream]


 From your log...

(WW) checkDevMem: failed to open /dev/mem (Permission denied)

Check permissions & ownership on /usr/local/bin/Xorg
Specifically, verify that it is installed setuid root.  For example,

-r-sr-xr-x  1 root  wheel  1695792 May 17  2010 /usr/local/bin/Xorg*

You can also try using x11/wrapper instead of installing the x server
setuid root.