AMD has recently dropped support for cards in series HD 2xxx-4xxx. Catalyst drivers for these cards are now available in a different branch, called Legacy series. Legacy drivers won't receive any new feature updates from AMD.
Proprietary fglrx drivers for these legacy cards are not compatible with Quantal.
*NOTE* Before you read this Howto:Graphic card driver installation is not an exact 100% science. There are many different graphics cards which require different drivers. Some will work with the Linux reverse-engineered versions, others need the proprietary Nvidia drivers from the Nvidia web page. This guide may not work for your card.
**The following guide is for users on ATI graphic cards and are currently using catalyst-legacy drivers**I. Why?With the upcoming linux kernel update and X.org group update, users may encounter some package conflicts.it is caused by the catalyst-legacy driver no longer supports the mainline X.org server, not only the version, but also the inner codes.II.
Phoronix: 35-Way NVIDIA/AMD Proprietary Linux Graphics Driver Comparison
Last week with Phoronix turning ten years old I celebrated by testing 65 different GPUs with the open-source Linux graphics drivers from Intel, AMD, and Nouveau. I also followed-up with power efficiency and thermal benchmarks from all of the graphics cards that played nicely on the latest open-source drivers.
Latest proprietary AMD Catalyst driver version 12.9 cannot be used with Ubuntu 12.10 If you have a AMD Radeon HD 2xxx-4xxx series card.
Drivers for these cards are now available in a separate branch called legacy series. Unfortunately these legacy drivers (version 12.6) have not been updated to work with Ubuntu 12.10.
There's a lot of futzing about and following various wikis with their ancient methods, some of which work, some don't, and all of them introduce problems. As the resident cleaner of AMD's horrible messes on this forum, I'm gonna write this guide and just point to it in the future. I'll keep updating this as time goes by and stuff gets more or less broken.