display problem with lenny

[Michael Dressel <MichaelTiloDressel@t-online.de>]

Hi,

since I have upgraded from etch to lenny the display (Xorg, gtk 
...?) seams to have a problem. When I scroll up or down with the web 
browsers epiphany or iceweasel horizontal lines appear on the web page.
It also happens when I move another window across the web browser. The 
stripes go away when I click on the top window bar.
I did not see this effect using konqueror.
I'm using GNOME. Part of my xorg.conf file looks like this:

Section "Device"
        Identifier      "ATI Technologies Inc 3D Rage II+ 215GTB [Mach64 
GTB]"
        Driver          "ati"
        BusID           "PCI:0:9:0"
EndSection

Section "Monitor"
        Identifier      "HM204D DT"
        Option          "DPMS"
        HorizSync       69.3
        VertRefresh     85
EndSection

Any suggestions?

Cheers,
Michael