2011/4/30 Joe 
<joe@jretrading.com>
On Sat, 30 Apr 2011 09:42:15 +0200
Raffaele Morelli <
raffaele.morelli@gmail.com> wrote:
> Hi,
>
> I have serious problem with  my ATI RV505 CE [Radeon X1550 64-bit], DE
> freezes randomly and I can't understand the reason.
xserver-xorg-video-radeon on 64 bit sid is broken. Mine does more than
freeze randomly, certain programs scramble the display instantly. I'm
using the previous 1:6.13.2-2 without problems.
Presumably my problem is one of these:
http://bugs.debian.org/cgi-bin/pkgreport.cgi?pkg=xserver-xorg-video-radeon;dist=unstable
--
Joe
I can log from another pc  when the amd64 freeze, I am on debian testing and now I have downgraded to xserver-xorg-video-radeonhd 1:6.13.1 from squeeze.
The problem seems to be solved... 
Regards
-raffaele