Kubuntu Gutsy Inspiron E1505 laptop Fn+UpArrow doesn't change brightness

[Larry]

Using KDE,   Fn+cursorPad UpArrow or Fn+DownArrow (bottom right of 
keyboard) doesn't change the brightness of the display.  Fn+UP/DOWN does 
change the display brightness in Fedora 8  (surprise!) and in Vista (no 
surprise).

When the brightness combination is pressed with  lshal -m  running,  I show

Start monitoring devicelist:
-------------------------------------------------
11:50:34.085: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-up
11:50:34.107: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-up
11:50:40.181: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-down
11:50:40.205: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-down

xev  shows (in part)
KeyPress event, serial 31, synthetic NO, window 0x3600001,
    root 0x10e, subw 0x0, time 807292635, (-352,957), root:(357,981),
    state 0x0, keycode 101 (keysym 0x0, NoSymbol), same_screen YES,
    XLookupString gives 0 bytes:
    XmbLookupString gives 0 bytes:
    XFilterEvent returns: False

Any ideas?

Thank you,

Larry