I want to use an external monitor with 1280 x 1024 resolution in the Dual View mode. But when I press Fn4, only three modes came out: LCD, CRT, LCD+CRT clone. There is no Dual view mode as indicated in the user manual. Also, the maximum resolution of the external monitor seems to be only 1152 x 864. I read comments by others on various forums that it seems possible to use an external monitor with high resolution (1900 x 1200) in dual view mode. Is this something I can do to change this? Is this a software issue or a hardware issue.