I've recently installed Ubuntu-x open source drivers for my ATI card on Ubuntu 12.04 LTS. I did it with the following commands:

sudo add-apt-repository ppa:ubuntu-x-swat/x-updates

sudo apt-get update

sudo apt-get install fglrx

And after running fglrxinfo, it returns the following:

$fglrxinfo

OpenGL vendor string: Advanced Micro Devices, Inc.

OpenGL renderer string: ATI Radeon HD 5670

My system still wasn't stable so I checked the 'Additional drivers' option and found out that the AMD/ATI proprietary drivers are activated. Does this mean I wasn't using the open source drivers at all? How can I make sure I'm using the open source drivers?

Help would be very much appreciated. Thanks!