I have SuSe linux distro and it work just fine, until I get originally ATI drivers (I download it from official ATI site). After drivers installation, I am not able to enter in graphical desktop. What I have to do to bring back KDE? Just don't tell me to reinstall it, please!
ATI propriety driver has some known issues. Many of them are described in documentation which can be found in ATIs official site. Regarding a problem I suggest you to check Xorg configuration file. Go through it and check if in drivers section is written frglx. If there is something else like radeon , then propriety ATI drivers are not loading. Next check the device section and pay attention to PCIBus. It should say something like 0.1.0. Try changing it to 0.0.1, because drivers often get confused if your graphic card has VGA, DVI outputs and TV out. That said they often miss on which display to send a picture.