rgo

# By default the behavior is:
#   Primary monitor work as always and second monitor only have one and fixed workspace 
#   I.e. you change to next workspace, primary monitor change to this workspace and second monitor remain as is.
# The desired behaviour is:
#   Primary monitor and secondary monitor are linked workspace.
#   I.e. you change to next workspace, primary monitor change to this workspace and second monitor too.

$ gconf-editor 
# Look for /desktop/gnome/shell/windows/workspaces_only_on_primary and set to false