[Gate-users] Problem with VGA

[Amel Cher]

Hello,
I installed Gate in Ubuntu 11.04, my VGA is AMD RADEON HD6470n
When I disable the VGA card,  visualization works perfectly, but Ubuntu starts only after the 4 or 5 start 
When the VGA and visualization is enabled I get this message
[Core-0] Starting macro ben.mac

 *** Break *** segmentation violation



===========================================================
There was a crash (#7 0xb6c6304d in SigHandler(ESignals) () from /home/amel/root/lib/libCore.so).
This is the entire stack trace of all threads:
===========================================================
#0  0xb772b424 in __kernel_vsyscall ()
#1  0xb3097d73 in waitpid () from /lib/i386-linux-gnu/libc.so.6
#2  0xb3037513 in ?? () from /lib/i386-linux-gnu/libc.so.6
#3  0xb316f8ed in system () from /lib/i386-linux-gnu/libpthread.so.0
#4  0xb6c5cf9d in TUnixSystem::Exec(char const*) () from /home/amel/root/lib/libCore.so
#5  0xb6c646fd in TUnixSystem::StackTrace() () from /home/amel/root/lib/libCore.so
#6  0xb6c62f3f in TUnixSystem::DispatchSignals(ESignals) () from /home/amel/root/lib/libCore.so
#7  0xb6c6304d in SigHandler(ESignals) () from /home/amel/root/lib/libCore.so
#8  0xb6c59e42 in sighandler(int) () from /home/amel/root/lib/libCore.so
#9  <signal handler called>
#10 0xb35edae8 in XF86DRIQueryExtension () from /usr/lib/fglrx/libGL.so.1
#11 0xb3469ae6 in ?? () from /usr/lib/i386-linux-gnu/libX11.so.6
===========================================================


The lines below might hint at the cause of the crash.
If they do not help you then please submit a bug report at
http://root.cern.ch/bugs. Please post the ENTIRE stack trace
from above as an attachment in addition to anything else
that might help us fixing this issue.
===========================================================
#10 0xb35edae8 in XF86DRIQueryExtension () from /usr/lib/fglrx/libGL.so.1
#11 0xb3469ae6 in ?? () from /usr/lib/i386-linux-gnu/libX11.so.6
===========================================================

simulation work by disabling the visualization in the macro
Could anybody help me?
Regards,