XFree86 config fails on 308d Thinkpad

I have just installed 4.6-RELEASE on an IBM 380d Thinkpad.  Previously
I had 4.2-STABLE and it worked great.  When trying to setup the
XFree86 server I get the following error:

The XFree86 configuration process seems to have
failed.  Would you like to try again?

Subsequent attempts with the other modes of setting X up also result
in the same error.  I looked in the /var/log/XFree86.8.log and I found
this line:

Fatal server error:
xf86EnableIO: Failed to open /dev/io for extented I/O.

And:

ls -l /dev/io
crw------- 1 root wheel 2, 14 Aug 4 20:27 /dev/io

Any ideas why this is failing?  The docs at XFree86's site say that
the 380d's video card, the neo2093 is supported, so I am kinda
confused.

Thanks,

fybar

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