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I have a similar problem. My only solution is to stay away from KDE. Try using GNOME. No black smuges!
I did some research at the KDE sight. It appears that quite a few people have reported the same problem. The official word is that it is an X problem having somethig to do with SiS video. It's funny that GNOME doesn't have this X problem.
So the story goes: KDE says it's an X problem and they won't fix anything. The X people say "It's not us, GNOME works fine" and they don't fix anything. So people with integrated video don't use KDE.
Intergrated SiS has always been a bit dodgy, its got more to do with SiS not disclosing all the hardware specs than anything else. KDE do not code for video, nor do gnome so blaming either of them for bad video performance is not the answer. Besides intergrated video blows and 4mb intergrated video blows bigtime.
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