The ABNT2 keyboards have 2 keys more then the usual PC104 keyboard. Those keys
are  one a '.' in the keypad (since in Brazil the decimal separator is ',' and
logicaly the key on the right of the '0' is a ','). The other is a key between
the left 'shit' and the 'Z' at the lower left of the keyboard.

Now this second key stands for [ '\' '|' 'º' '˘' ] or as configured in the
symbols/br:

     { [ backslash,        bar,    masculine,   dead_breve ]	}

The problem appear when we use two keyboards, in my case I have a standart
laptop keybooard and a external one with the ABNT2 layout. In the configuration
made by "Ricardo Y. Igarashi <iga@that.com.br>" you have that key labled <BKSL>
that in the same lable for a key with a similar layout in the pc104 keyboard.
This rename operation makes the key in the english layout simply disapear. 

I made a few changes in my configuration that make it all ok. I configured the
layout as ABNT2 and multiple layouts (Br and US international). After I made the
following simple changes to /usr/lib/X11/xkb/symbols/br and
/usr/lib/X11/xkb/keycodes/xfree86 all worked fine.

--------------- br.diff -----------------------

32c32,35
<     key <AC12>  { [bracketright, braceright,  masculine,    masculine   ] };
---
>
> // Altered by Victor Bogado <victor@bogado.net>
> //    key <AC12>  { [bracketright, braceright,  masculine,    masculine   ]
};>     key <BKSL>  { [bracketright, braceright,  masculine,    masculine   ] };
36c39,42
<     key <BKSL>        { [ backslash,        bar,    masculine,   dead_breve ]};
---
> // Altered by Victor Bogado <victor@bogado.net>
> //    key <BKSL>      { [ backslash,        bar,    masculine,   dead_breve ]};
>     key <AC13>        { [ backslash,        bar,    masculine,   dead_breve ]};
>

--------------- xfree86.diff -----------------------
407a408
> // Altered for compatibility
410,411c411,415
<     <BKSL> = 94;
<     <AC12> = 51;
---
> // Altered by Victor Bogado <victor@bogado.net>
> //    <BKSL> = 94;
> //    <AC12> = 51;
>     <BKSL> = 51;
>     <AC13> = 94;