Kevin P. Neal writes:
> 
> Using the XF86_Mono, XF86_VGA16, and XF86_SVGA servers I run as root
> from the command line:
> /usr/X11R6/bin/X -verbose 2>&1 
> 
> I get this error:
> (--) checkDevMem: warning: failed to open /dev/mem and /dev/xf86
>         (No such file or directory)
>         linear framebuffer access unavailable
> 
> Fatal server error:
> xf86MapVidMem: Could not mmap /dev/vga (Invalid argument)

Do you have 'options INSECURE' in your kernel config?  Or have you
loaded the aperture (pkgsrc/sysutils/aperture) driver?
(options INSECURE is the default in i386/conf/GENERIC)

The X server needs to open /dev/mem in order to map the video card.
(e.g. "linear" mode)

-Andrew