I've been using my iMac A1145 for a while now, and for some reason I never noticed, until now, that there doesn't seem to be a brightness option, as far as I can tell, for it in preferences to reduce or increase that feature of the screen itself, or does someone know how to adjust the screen brightness on these iMacs?

There is of course a keyboard control for the PowerBooks, and other notebook type hardware. For the MacMini you need a separate screen that usually has some independant way to adjust the screens brightness but with the iMac there doesn't seem to be this feature supported, as yet, is this an oversight, or a problem in working out just how Apple got it to function with Mac OSX, and make it work within MorphOS?