Here's the patch that fixes this bug. Thanks, Otavio, for formalizing and testing it.
--
diff -ruN console-data-20060718-old/keymaps/i386/qwerty/br-abnt2.kmap
console-data-20060718/keymaps/i386/qwerty/br-abnt2.kmap
--- console-data-20060718-old/keymaps/i386/qwerty/br-abnt2.kmap 1999-08-29
16:15:26.000000000 -0300
+++ console-data-20060718/keymaps/i386/qwerty/br-abnt2.kmap 2006-10-03
14:55:17.000000000 -0300
@@ -65,3 +65,5 @@
keycode 86 = backslash bar
alt keycode 86 = Meta_less
+
+keycode 89 = slash question degree
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