Testing radeon KMS on Ubuntu
We have set up a package repository at https://launchpad.net/~xorg-edgers/+archive/radeon-kms which has kernel, libdrm, mesa and -ati packages for testing kernel mode-setting (and GEM/TTM/DRI2) on Ubuntu Karmic. The packages might install on Jaunty as well.
The above page also links to a Karmic-based live CD image (URL might change) which has all bits installed and simply boots up to the wonderful world of KMS...
Warning: This is experimental code so do not install it on your production system or anywhere where you have valuable data.