Update of the solution (18 nov 2012)
because new drivers are available in ATI website.
Solution in 12.04LTS is then:
Uninstall ATI driver
$ sudo sh /usr/share/ati/fglrx-uninstall.sh --force (if file is existing)
$ sudo apt-get remove --purge fglrx fglrx_* fglrx-amdcccle* fglrx-dev*
Install free driver
$ sudo rm /etc/X11/xorg.conf
$ sudo apt-get install --reinstall libgl1-mesa-glx:i386 libgl1-mesa-dri:i386 xserver-xorg-core
$ sudo dpkg-reconfigure xserver-xorg
Reboot
$ sudo reboot
Download ATI driver
Check what is your Graphic Card: lspci -v | grep -A 12 VGA
Download the appropriate driver for your machine here from the AMD/ATI Website .
File should be something like amd-driver-installer-12.6-legacy-x86.x86_64.run
If you are looking for old driver 12.6, today (Jan 2015) it is not available anymore in AMD website. Solution is to to search it in mirror websites.
Create a folder
$ mkdir ~/catalyst12.6/
$ cd ~/catalyst12.6/
And move your downloaded driver in it.
Unzip it if needed.
$ unzip amd-driver-installer-12.6-legacy-x86.x86_64.zip
Install ATI driver
$ sudo apt-get install build-essential cdbs dh-make dkms execstack dh-modaliases fakeroot libqtgui4
$ sudo chmod +x amd-driver-installer-12.6-legacy-x86.x86_64.run
$ sudo sh ./amd-driver-installer-12.6-legacy-x86.x86_64.run --buildpkg Ubuntu/`lsb_release -sc`
$ sudo dpkg -i fglrx*.deb
$ sudo amdconfig --initial -f
Reboot and Check if installation is successful
$ sudo reboot
$ sudo fglrxinfo
display: :0 screen: 0
OpenGL vendor string: Advanced Micro Devices, Inc.
OpenGL renderer string: ATI Radeon HD 4200 Series
OpenGL version string: 3.3.11653 Compatibility Profile Context
It is all good, as you can see, after last reboot, fglrxinfo
displays my ATI Graphic card correctly.
Thanks
I found this solution thanks to Pavel and his link
Note
I applied successfuly this solution on 3 PCs on 12.04LTS :
- one with a ATI Radeon HD 3400
- one with a ATI Radeon HD 4200
- one with a ATI Radeon HD 4350
Successfully on hybrid ATi Radeon HD 5650/Intel with driver version 12.10, Precise Pangolin 12.04.02 with configuration in BIOS select 'discrete' graphic. (Acer aspire 4745G)