I've been having slowdowns in Ubuntu since upgrading to 12.04, sometimes even freezing and crashing my PC. I'm using an AMD Athlon II X2 with 3 GB ram, and an ATI Radeon HD 5670.
I've already installed the ATI drivers from their website but I'm not sure if it uses the driver. From system settings > details, it shows up as VESA - REDWOOD.
UPDATE: Here are the results of running 'glxinfo' and 'fglrxinfo'
$glxinfo server glx vendor string: ATI server glx version string: 1.4 $fglrxinfo OpenGL vendor string: Advanced Micro Devices, Inc. OpenGL renderer string: ATI Radeon HD 5670
So, I suppose I have the ATI driver? But it still freezes or slows down occasionally, is anyone also experiencing this on Ubuntu 12.04 with ATI graphic cards?