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1b1ed1a
(Get the code!)
We have exactly the same kind of ATI board ("01:00.0 VGA compatible controller: ATI Technologies Inc RV350 AS [Radeon 9550]") which we can quite reliably and quickly crash in Jaunty by just taking "Preferences / Screensaver" and with "Preview" previewing some 3D-intensive screensavers; "SkyRocket" seems one of the quickest to kill the machine and turn off DVI signal to the LCD monitor.
We will experiment with 'Option "NoAccel" / "DRI" "false" / "RenderAccel"' and with 'Disable "glx"' but I'm suspecting that disabling anything which prevents screensavers from using OpenGL with direct rendering is going to help...