Strange colors after screen resize

[NemomeN]

Hi!

After I resized my screen from 1024 x 768 to 800 x 600 some graphics get strange colors. Especially images, but the most GUI components such as windows, menus, buttons and icons are ok. For example the desktop background image got strange colors. Also many images om the web got strange colors.

I've a PCI express ASUS Extreme 700 pro graphic card. The only screen size I can select is 1024 x 768, 800 x 600 and 640 x 480. The only refresh rate is 73 Hz. In both cases it's mush less options available then in Windows.

What's wrong and how do I fix my color problem? Maybe my graphic card hasn't been detected or configured correctly. Where can I find out what card Knoppix has detected? Could it have something to do with color depth? Any help would be mush appreciated!

Thanks!

[NemomeN]

The exact name of the graphic card should be ASUS Extreme AX700 Pro (manufacturer ATI). And I’m using Knoppix 3.8.2.