problem setting color

I having problem with setting color . I do this on kde configure desktop -> display -> gamma .

the problem is every time I reboot , it reset or after come back from screen saver.

the strange part is every time it get reset I go back to the setting , it auto prompt me to save the new setting . when I click ok (enter admin password) , the color back to the way I set with out i need to do anything.

anyway to keep the setting permanent ?