Setting Mod4 in awesome

Question

I'm trying to set up awesome. When I start it the Mod4 (Windows) key is not working. So I tried to extent my .Xmodmap

clear Mod4
add Mod4 = Multi_key

When I run xmodmap .Xmodmap the Mod4 works, but there is "some" left. If there is an open terminal and I press Mod4+Ret to open a new terminal the computer either beeps or on the old terminal there is some dead key (pressing a results in å). I tried several clear rules in the .Xmodmap, but neither worked. How can I best enable the Mod4 in awesome?

xev reports:

KeyPress event, serial 33, synthetic NO, window 0x1200001,
    root 0x13c, subw 0x0, time 36080759, (-557,202), root:(187,223),
    state 0x0, keycode 133 (keysym 0xff20, Multi_key), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: True

KeyRelease event, serial 33, synthetic NO, window 0x1200001,
    root 0x13c, subw 0x0, time 36080859, (-557,202), root:(187,223),
    state 0x0, keycode 133 (keysym 0xff20, Multi_key), same_screen YES,
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False

Answer 1

The awesome FAQ provides an answer:

Why does Mod4 "swallow" succeeding key presses?
On some systems xkb by default maps the left windows key to "Multi_key" (at least in us and de layouts). Multi_key is an xkb feature which may be used to access uncommon symbols by pressing Multi_key and then (consecutively) two "normal" keys. The solution is to remap your windows key to mod4 and remove the Multi_key mapping. This can be done by including "altwin(left_meta_win)" in the xkb keyboard description xkb_symbols line.

   #!/bin/bash
   xkbcomp - $DISPLAY<<EOF
   xkb_keymap {
   xkb_keycodes  { include "evdev+aliases(qwertz)"};
   xkb_types     { include "complete"};
   xkb_compat    { include "complete"};
   xkb_symbols   { include "pc+de(nodeadkeys)+inet(evdev)+group(alt_shift_toggle)+level3(ralt_switch)+altwin(left_meta_win)+capslock(escape)"    };
   xkb_geometry  { include "pc(pc104)"};
   };
   EOF