I've forced both, FSAA and AF through Catalyst panel and it does exactly NOTHING to the game. It's OpenGL so how the hell can that be!? Modern games ok because of deferred rendering but Quake engine from 2 decades ago!?

I'm using the high resolution patch/tweak. Could that be the reason? Though I doubt it...

Hi,

Everything works fine on Nvidia cards for years, so KP engine is ok.
Long time ago, issues has been reported about openGL support with AMD cards. But I imagine it has been solved...