[intrepid] bad keycode on kubuntu.xmodmap (XF86AudioLowerVolume)

Binary package hint: kubuntu-default-settings

kubuntu-default-settings:
  Installed: 1:8.10-13
  Candidate: 1:8.10-13
  Version table:
 *** 1:8.10-13 0

When I push the special Audio-stop key on my laptop, I get in xev:
 KeyPress event, serial 31, synthetic NO, window 0x3200001,
    root 0x7b, subw 0x0, time 1351189, (-1086,-55), root:(11,524),
    state 0x0, keycode 174 (keysym 0x1008ff11, XF86AudioLowerVolume), same_screen YES,
    XKeysymToKeycode returns keycode: 122
    XLookupString gives 0 bytes:
    XmbLookupString gives 0 bytes:
    XFilterEvent returns: False

But the volume-down key works fine and I get in xev:
 KeyRelease event, serial 34, synthetic NO, window 0x3200001,
    root 0x7b, subw 0x0, time 1437930, (-765,-168), root:(332,411),
    state 0x0, keycode 122 (keysym 0x1008ff11, XF86AudioLowerVolume), same_screen YES,
    XLookupString gives 0 bytes:
    XFilterEvent returns: False

In the kubuntu.xmodmap I find:
 keycode 174 = XF86AudioLowerVolume

If I comment that line, The audio-stop key shows in xev:
 KeyRelease event, serial 34, synthetic NO, window 0x2e00001,
    root 0x7b, subw 0x0, time 186665, (-773,-416), root:(324,163),
    state 0x0, keycode 174 (keysym 0x1008ff15, XF86AudioStop), same_screen YES,
    XLookupString gives 0 bytes:
    XFilterEvent returns: False

It's seem that the keycode 174 is a problem on my laptop:

Linux portatil 2.6.27-7-generic #1 SMP Tue Oct 14 18:40:44 UTC 2008 i686 GNU/Linux
ASUSTeK Computer Inc.
F3F
1.0