I have the following hardware:
01:00.0 VGA compatible controller: ATI Technologies Inc RV516 [Radeon X1300/X1550 Series]
01:00.1 Display controller: ATI Technologies Inc RV516 [Radeon X1300 Pro] (Secondary)
This is on a Dell Optilex 755.
Ubuntu Hardy, and the closed source drivers version 8.5.
If I start X (no clients running; not even a window manager), then I get a corrupt mouse mouse pointer (in a square region) and after several seconds the entire computer freezes.
Turning off DRI entire solves the problem, but I want DRI on. At least on one monitor.
I have searched these forums, so far the only problems I have noticed with X1300 cards is after X starts and when window managers start loading, but this occurs just starting X without loading any clients. I will keep searching just in case I missed something.
I also have tried both dual-head and bigdesktop mode, both result in the system hanging.
Unfortunately, because the system freezes rock solid, this hampers my ability to get accurate and detailed logs, however I try that again after posting this.