It will be fixed with next release of laptop-mode-tools.
To fix it manually and just now, simply edit the file /usr/sbin/laptop_mode :
At about line 506 (activate Options=> Line numbers) you find:(For example)
sudo leafpad /usr/sbin/laptop_mode
case "$KLEVEL" in
"2.4" ) ;;
"2.6" ) ;;
*)
add a line under "2.6" ) ;; so that it looks like :
Then restart laptop-mode:case "$KLEVEL" in
"2.4" ) ;;
"2.6" ) ;;
"3.0" ) ;;
*)
sudo /etc/init.d/laptop-mode restart