I have purchased MSI A6300 notebook yesterday. I got Ubuntu 11.04 popularly known as Natty narwal operating system. I loved this laptop as well as the new version of Ubuntu. But I am having problem with this notebook or this operating system. When I try to hibernate, reboot and so on then it does not do so properly. I want to know whether it is a known popular issue that it hangs while performing shutdown, restart, and hibernate. Please help me to solve this problem.