Horizontal black lines (about 20mm wide) are usually a sign of frame synch slipping. The 'frame' is the vertical synchronisation, to prevent the picture rolling up and down.
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I also noticed that many games run very slowly. Are the intel HD graphics really that bad on linux?
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In a word, yes. You can cycle through the video drivers and try for the one that works best. Have you a 32 bit mesa/driver setup? It may help
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The question is: Am I missing some sort of 32 bit library for these games? Or a driver of some sort?
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Probably. test with 'ldd /path/to/executable |grep found' Anything shown is a problem. You can also drop the '|grep found' and check that it's not pulling in libs from crazy places.
Also, try panning slower, Throughput is probably a problem. A game running on 320x200 would do better than one on 1024x768.
post the output of glxinfo |grep render