OK i resolved this issue by
#1 removing all the references to the fglrx driver,
#2 doing apt-get update,
#3 reinstalling the fglrx driver
everything worked fine, since that dual monitors with compiz rolling out nicely,
fglrxinfo:
display: :0.0 screen: 0
OpenGL vendor string: ATI Technologies Inc.
OpenGL renderer string: ATI Radeon HD 2400 XT
OpenGL version string: 2.1.8087 Release
OK i resolved this issue by
#1 removing all the references to the fglrx driver,
#2 doing apt-get update,
#3 reinstalling the fglrx driver
everything worked fine, since that dual monitors with compiz rolling out nicely,
fglrxinfo:
display: :0.0 screen: 0
OpenGL vendor string: ATI Technologies Inc.
OpenGL renderer string: ATI Radeon HD 2400 XT
OpenGL version string: 2.1.8087 Release