Hi Valter, I had this problem long ago with a very similar configuration. It vanished when Alex Deucher modified some details (like rounding) in the Radeon mode setting/calculation code.
I don't know about the details, but maybe you can copy the modeline generated by the proprietary driver and force the open-source radeon to use it. But I'm not sure it's possible, and even if I don't know how to do it ;) In my case, the problem also did depend on the LCD - perhaps you can check other models. Cheers, Simon On 10/29/2011 06:52 PM, Valter Giovannetti wrote: > Hi. > Excuse me for my bad english! > I am a newcomer to Ubuntu and Italian! > > On my computer I have an ATI Radeon 9200 AGP- RV280 chip. > The Operating Systems are: Windows XP and Ubuntu 11.04. > In WindowsXP all work ok. > Everything works fine with Ubuntu, 3D acceleration, if I use the VGA > output. > Apart from the top rows in windows, when I move. > But the DVI output does not work well, if I try to move, enlarge a > window, the monitor turns off and on again. > As if the video signal disappear. > I searched various forums how to fix the problem, but nobody could help me. > By installing the proprietary driver, present in the repositories, > everything works fine, but 3D acceleration vanishes. > Can you helpme? > Thank you. > _______________________________________________ > xorg@lists.freedesktop.org: X.Org support > Archives: http://lists.freedesktop.org/archives/xorg > Info: http://lists.freedesktop.org/mailman/listinfo/xorg > Your subscription address: simon.t...@gmx.de > _______________________________________________ xorg@lists.freedesktop.org: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.freedesktop.org/mailman/listinfo/xorg Your subscription address: arch...@mail-archive.com