Google search doesn't realy offer any similar symptoms:
I have a Toshiba Tecra R850 that is working well except the interval display has shifted about one third to the right - even in the bios!
Windows "thinks" the full width of the display is there, and a vga display connected eternally shows the full width correctly, when set to duplicate the main display.
From Windows 10 I have removed display adapter and it correctly reinstalls as a HD 3000.
There is nothing in the bios about display...