With this board:

01:00.0 VGA compatible controller [0300]: ATI Technologies Inc RV280
[Radeon 9200] [1002:5961] (rev 01)

The right setup for me is:

modeset disabled

and the following xorg.conf file:

---
Section "Device"
        Driver "ati"
        Identifier "Radeon 9200"
        Option "BusType" "PCI"
        Option "AGPSize" "64"
EndSection

Section "Monitor"
    Identifier    "Configured Monitor"
EndSection

Section "Screen"
    Identifier    "Default Screen"
    Monitor        "Configured Monitor"
    Device "Radeon 9200"
EndSection
---

modeset  must be disabled in order to really have BusType and AGPSize
parameters taken into account.

Also, EXA should not be activated if I want good performance when
scrolling pages in firefox or chromium.

-- 
(Needs KMS) Background and full screen apps don't show up when Normal Visual 
Effects on (Radeon 7500) 
https://bugs.launchpad.net/bugs/444139
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