Two different keys are mapped to XF86AudioRaiseVolume in
/usr/share/X11/xkb/symbols/inet. Because of that, the volume-up button doesn't
work properly in KDE (and GNOME?).

I opened a bug on KDE's site: http://bugs.kde.org/show_bug.cgi?id=132567 -
which was correctly resolved as invalid.
Here's a link with some info from Debian:
http://lists.debian.org/debian-x/2006/04/msg01842.html

And here's a simple patch:

--- /usr/share/X11/xkb/symbols/inet     2006-09-11 00:30:41.809230136 -0700
+++ /usr/share/X11/xkb/symbols/inet.new 2006-09-11 00:31:31.574664640 -0700
@@ -1089,7 +1089,6 @@
     key <I22> { [ XF86AudioPlay, XF86AudioPause ] };
     key <I24> { [ XF86AudioStop ] };
     key <I2E> { [ XF86AudioLowerVolume ] };
-    key <I2F> {        [ XF86AudioRaiseVolume ] };
     key <I30> { [ XF86AudioRaiseVolume ] };
     key <I32> { [ XF86HomePage ] };
     key <I3B> { [ XF86New ] };


I assume that there shouldn't ever be two different key codes for the same
symbol. I looked at Xlib functions, and it seems that it's ok to have multiple
symbols with the same keycode, but not vice versa.