Ubuntu 10.04 / Radeon HD 4890 / Very slow

[bugmenot2]

Hi,

Im using a ATI Radeon HD 4890 graphics card on my Ubuntu 10.04 system. My problem is that when i'm using the "fglrx" driver no matter which version ( i tested 10.2 - 10.4 ) i have lower performance than with the opensource "radeon" driver. This causes laggs whenever i scroll in Firefox and other annoying things like that.
Is there any solution for this?

[Arch]

I'm having performance issues as well since the upgrade. If you don't have Compiz turned on, try doing so -- in my case it actually increased performance. With the exception of a few apps (mostly OpenGl-based in my case) my system is actually running quite smoothly now.

(That's with an HD4850 and fglrx 10.4 -- still hoping the situation will improve with 10.5 though)

[Aesptux]

I have an HD4890, and I can't make it work with Ubuntu 10.04.

Since I upgraged, it's fucked up.

I tried with fglrx, and OS drivers and still nothing.

I installed fglrx from terminal, and from drivers manager.
Now I don't have any drivers installed, and the frame (boton layout) of the windows isn't showing, so compiz isn't working I think. I tried to activate anyway the advanced desktop effects, and I don't why/how... Ubuntu searches some drivers, and it CAN activate effects, so compiz works again. But if I go to Drivers Manager, it doesn't show any driver, and when I reboot, compiz brokes again.

I already thought the option of changing window manager, but I like compiz, and well, I love advanced desktop effects, but everything's crappy.

I'm considering of changing my Ubuntu to Debian, Arch Linux or another.