I said probably, and as you already said I was wrong.
I hope it is KDE 4 fault. With KDE 3 on Solaris there "should not" be any problems. KDE 4 is buggy ...
Well, if I am wrong again, I'm very sorry, I can not help you, because I never tried (Open)Solaris so anything software/hardware related directly to (Open)Solaris is out of my interest. But I have some small experience with HP-UX
....