https://bugs.freedesktop.org/show_bug.cgi?id=8056

--- Comment #48 from Michel Dänzer michel@daenzer.net 2011-03-27 04:30:13 PDT --- (In reply to comment #47)

(In reply to comment #46)

...

The UseVBO=True hack

Hack? I used this years ago with the classic r300 driver and don't remember it misrendering anything. Do you have a link or something that explains why it's a hack?

It's right there in the parts you didn't quote:

(In reply to comment #46)

The UseVBO=True hack is not enabled by default for a good reason: it misrenders the skybox, foliage and a few lightmaps. This is the game's issue, [...]

Basically, it appears that the UseVBO path was abandoned at some point during the development of the game.