Sorry to reply to myself, but I also needed to copy
/etc/X11/XF86Config-4 to /etc/X11/xorg.conf -- the default location of
the config file changed, but it will fall back to XF86Config if
xorg.conf isn't present.  It didn't seem to notice XF86Config-4, though.

-- 
Bill Jonas    *    bill@billjonas.com    *    http://www.billjonas.com/
"It's a dangerous business, Frodo, going out your front door.  You step
into the Road,  and if you don't keep your feet,  there  is  no knowing
where you might be swept off to."  --  Bilbo Baggins