@Neil Burgin - I'm glad to hear that you are satisfied with the
performance of the current open-source radeon driver.  There have indeed
been many recent performance improvements to the open-source radeon 3D
graphics driver. This includes radeon KMS page-flipping which was
introduced in the 2.6.38 kernel which was used in Ubuntu 11.04 "Natty
Narwhal"; and the switch from the classic Mesa 3D driver to the
Gallium3D Mesa driver which happened in Mesa 7.9 (used in Ubuntu 10.10)
for Radeon X1000 series GPUs and earlier, and in Mesa 7.10.1 (used in
Ubuntu 11.04) for Radeon HD 2000 series GPUs and later.  There were
further Radeon performance improvements in Mesa 8.0 (8.0.4 is currently
available in Ubuntu 12.04 "Precise Pangolin") and in Mesa 9.0.  Ubuntu
12.10 "Quantal Quetzal" is using Mesa 9.0.  Also, kernel 3.4 introduced
2D color tiling support for Radeon HD 5000 and HD 6000 series GPUs,
which boosts performance when used in conjunction with Mesa 9.0.  Ubuntu
12.10 "Quantal Quetzal" is using a kernel which is based on the upstream
3.5 kernel.

If you ever need more performance from this driver and you have a Radeon
HD 2000 or later, support for PCI Express 2.0 (PCI-E 2.0) was finally
added to the open-source radeon driver in the 3.6 kernel.  This has been
shown to increase performance for some OpenGL workloads.  A PPA of this
kernel is available at http://kernel.ubuntu.com/~kernel-ppa/mainline/
and instructions on how to install and uninstall it are at
https://wiki.ubuntu.com/Kernel/MainlineBuilds

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https://bugs.launchpad.net/bugs/1058040

Title:
  fglrx-installer not working with HD2000-4000 "legacy" cards in Quantal

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