Possible Duplicate:
Is my ATI graphics card supported in Ubuntu?
How can I install the ATI video card driver for Ubuntu 11.10?
Can someone please help me?
Possible Duplicate:
Is my ATI graphics card supported in Ubuntu?
How can I install the ATI video card driver for Ubuntu 11.10?
Can someone please help me?
The best driver, Gallium 3D, should automatically be enabled and installed.
Try running a 3D game like Neverball or Neverputt, you can find both in Ubuntu Software Center.
If they don't work install fglrx (not the post-release update) with Additional Drivers in System Settings.
This steps worked for me and what you probabably should do is upgrade you ATI drivers. They have solved a lot of those issues you're facing on.
http://www.upubuntu.com/2011/12/how-to-install-amd-catalyst-1112-linux.html
For smooth installation, it is recommended to uninstall currently available Catalyst driver. To do this, use these commands from the terminal:
sudo apt-get remove fglrx*
To install the AMD Catalyst 11.12 Linux driver now on Ubuntu 11.10 (32-bit & 64-bit) or any older version, run this sequence of commands:
cd ~/; mkdir catalyst11.12; cd catalyst11.12/
wget -O ati-driver-installer-11-12.run http://www2.ati.com/drivers/linux/ati-driver-installer-11-12-x86.x86_64.run
If you have a 64 bit system, then install this before anything
sudo apt-get install ia32-libs
After that you can start installing the new ati driver:
chmod +x ati-driver-installer-11-12.run
sh ./ati-driver-installer-11-12.run
Make now an update for the X.org file with this command:
sudo aticonfig --initial -f
sudo reboot