So, now that I've stopped pissing around with the open source ati drivers (which are fine for desktop use, but rubbish for gaming), and installed the Catalyst drivers from AMD, I can actually run 0AD on my laptop with Linux! Result! Plus, the Catalyst 11.4 drivers will support my switchable graphics, which will be a bonus, so I can make full use of my Graphics chipset. In short, life is good.