the latest display for any ati system can be found here: Ati display drivers
you have to pick your OS and video card, and it'll take you to the latest driver. However, it is a 5.10, which may be the same as yours. I have a 7000 Ati Radeon mobile card, and my driver is ALWAYS acting up! It's frustrating, I know. If you are running on Windows they sometimes have hardware updates for supported display drivers on their website.
If you're feeling bold, you could try these: Omega drivers
I recently started using these drivers, and so far I'm happy with them! They might be compatible with your system, but microsoft doesn't support them, so be careful! Of course, I'm NOT a computer expert, so if you want to ignore me, I won't take it personally. Hope you can solve your problem!