Okay, so WHY is intel's legacy driver way better than the new one?

I bit the bullet and installed the intel-legacy video driver because I wanted to see if it was true that the old one was better than the new.
Result: Compiz is REMARKABLY smoother. As in, I'd forgotten just how pretty a silky smooth Compiz setup really is. I've done no benchmarking, don't care to. The point is, for example, I can set the opacity to 85% in the Move Window plugin and it doesn't hose the framerate.
My question is, why? What's going on in the new driver that made the performance totally tank? When there's a new driver and EVERYONE seems to have the same problem, I'm a little confused as to why they "improved" it.

Not only KMS, but also DRI2 and GEM. The next Intel video driver release should support only UXA, getting rid of the legacy cruft and concentrating on supporting one option properly.
http://www.freesoftwaremagazine.com/col … g_features
http://www.freesoftwaremagazine.com/col … t_graphics
Last edited by lucke (2009-06-06 14:08:13)

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