I have ubuntu 12.04.2 and kde. I have fglrx 13.1 latest drivers. Sometimes I have freezes at starup, it's very annoying, and I discovered it's bug : http://ati.cchtml.com/show_bug.cgi?id=691
So maybe I should remove fglrx proprietary drivers and go back to mesa open drivers.
I want a failsafe graphics gui to fall back on whilst I'm working with fglrx drivers for a Radeon HD7950. I've just put this in my son's desktop, it's a recent fresh install of 12.04 LTS 64bit on a SSD, initially with a Radeon HD7750.
I just got Steam, and downloaded a game. It took a while, then told me I need the latest OpenGL software for my driver. So, I went to amd.com, found my driver( for the Radeon HD 6570 ) and, not to mention I couldn't do a non-force install, whenever it finished installing, and I rebooted, Unity was gone.
I am trying to install the Catalyst driver. The best I can get is a strange resolution problem and firefox acts all wonkt. The worst I have gotten is low graphics mode in which I just reinstall Ubuntu.
I have a HP Pavilion Dv7 laptop. With Radeon 3200 HD. I plan to try again with a fresh install of Ubuntu 12.4.3 as I have heard its the most compatible.
fglrx is ATI Catalyst and is closed source. The radeon driver is FOSS. The radeon driver has some issues on certain hardware so some folks opt to install fglrx. Some people on here have recently reported problems using fglrx when using Debian Sid/Unstable.