[My SOLUTION] 
in my lubuntu 14.04 same problem. Googling I found 100%cpu utilisation is due 
to the two processes: ibus-daemon and ibus-x11

1st SOLUTION: start menu > Preferences > Language Support > Keyboard
Input Method System: none

2n alternate SOLUTION: sudo apt-get remove ibus

NOTE:
IBUS is an "alternative" to setxkbmap
IBUS has many problem with some keyboard under lubuntu 14.04
see also (ibus daemon cpu use flares up briefly when editing in Gedit) at 
https://bugs.launchpad.net/ubuntu/+source/ibus/+bug/1299759

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https://bugs.launchpad.net/bugs/367372

Title:
  Gedit uses 100% of the CPU while editing files

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