bridgman: what usually happens with the kernel is the team tries to do roll-up releases every few weeks, so that we don't get a flood of kernel releases with small fixes, and each big release has a bit of time to get some vague testing done on it. The other components are a little less scheduled, but Dave will push an update when he thinks he's got everything that should go into it done right, I think.
Kernel updates can be problematic, usually KMS is not that important, but there are really differences if a wlan driver works or not with a specific kernel version. For some specific hardware it could be needed even to downgrade to .28. The problem with fedora is, that the environment is relatively uptodate - and especially fglrx will not run. So you are forced to use oss drivers if you want em or not. I don't get why fglrx devs are so overworked that they could not add support for new xservers in time, nv devs manage that too.
dodoent: glxgears is not a benchmark, it's not even anywhere close. It would be a much better idea to test with something more resembling real world use than three extremely simple non-lit, non-textured, rotating shapes. Phoronix's own benchmarks are probably the best thing for 3D testing on Linux, actually. Try those.
hobbes: on a quick search I can't find a report of that problem in Fedora or freedesktop.org Bugzilla, or Launchpad. You might want to file a report at fd.o or Launchpad, I guess. Have you verified that it works OK if you disable KMS (nomodeset)?
Yes, it does work with nomodeset. Sorry for the delay to answer.