Sky/Fog/Lighting problems during gameplay GTA San Andreas on Ubuntu Quantal and Intel Mobile 4 Series

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http://askubuntu.com – during the gameplay, while outside, I get problems in the rendering of what I guess would be lighting and/or weather effects. Even with Effects level to "low". The scenery is rendered properly, no texture missing, but is overlapped by single color polygons. With Effects level higher than "low", those rendering problems get worse, the sky is not rendered at all, with varying colors and contours of the scenery leaving traces in the sky. I am a newbie and I've been not able to get screenshots to spot. I'd appreciate if you could please help me, also in extracting the information needed from you i (HowTos)