I'm using ThinkPad x120e with Ubuntu 11.04. I updated the graphics driver using "Additional Drivers" program (AMD Radeon™ HD 6300M Series Graphics.) When I work at home, I want to use my external monitor. So, I changed some settings using ATI Catalyst Control Center, disabled notebook's display, set external monitor as default and restarted.
Now, login screen is only shown in external monitor just like I wanted, however when I log in to my account the display switches from external monitor to notebook's monitor, and external monitor is disabled. When I go back to login screen, display switches again. I want to use external monitor only as long as it is connected to the computer. Any ideas how I can do that, and why the computer is behaving like that?