In recent linux distro, hal is not lauchned by default because it is not needed anymore. So I have to launch manually HAL for arista to work.
HAL has been deprecated if I am right (?). So if you could find a way to remove its use and find something else to use instead ???
If you have python-gudev installed it will use udev rather than dbus/HAL for device discovery. HAL support is left in for older distros that don't have udev yet!