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Okay, I fixed it. The problem was that I had XLIB_SKIP_ARGB_VISUALS environment variable set to "1". Unsetting it fixed the problem and now I get working OpenGL compositing with KDE 4.1.

Yeah, I've heard people complaining about NVidia and compositing as well, but from what I gathered, the complains are about crappy drivers giving them unusable performance while compositing, which isn't my case. Well, thanks for your effort anyway. x)

My kwinrc contains this: Source code 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 [Compositing] Enabled=true [Desktops] Name_1= Name_2= Name_3= Name_4= Number=4 [Plugins] kwin4_effect_blurEnabled=false kwin4_effect_boxswitchEnabled=true kwin4_effect_coverswitchEnabled=false kwin4_effect_desktopgridEnabled=true kwin4_effect_dialogparentEnabled=true kwin4_effect_diminactiveEnabled=false kwin4_effect_dimscreenEnabled=false kwin...

Hi, I just installed KDE 4.1 on my desktop -- so far it's been working fine, except I can't get OpenGL desktop effects to work. When I try to enable OpenGL compositing, I get no effects -- as in, the screen looks exactly as with effects disabled. On the tty from which I started X I can see: Source code 1 2 3 kwin(3108): Couldn't find framebuffer configuration for depth 32 (no ARGB GLX visual)! kwin(3108): Failed to initialize compositing, compositing disabled kwin(3108): Consult http://techbase....