Ubuntu12.04 dual graphics card problems ...... (Thank you for your answers)

Ubuntu12.04 dual graphics card problems ...... (Thank you for your answers.)-Linux general technology-Linux technology and application information. For more information, see the following. First problem: after I installed Ubuntu12.04 on the camera, the driver of the integrated graphics card is open-source, then I installed the closed-source driver on the independent graphics card on the official website N, and then I started to disable the integrated graphics card. The problem was solved, when my independent video card driver entered the screen, its resolution was 800*600. it looked quite uncomfortable. then I modified it with the xrandroid command, the screen resolution is also converted. the conf file is set, but when the system is shut down and restarted again, the resolution is restored to 800*600, which is unpleasant. Is there any way for the experts to stop restoring the resolution to 800*600 at startup, and how to save the resolution set by the xrandroid command.
The second problem: after I installed the independent driver, I installed the virtualbox virtual machine on the machine, and then installed windows xp in it, online games are also installed in the system. However, when online games are started, the system prompts that 3D rendering is insufficient and online games cannot be started. I checked the Setting Display 3D acceleration of virtualbox and checked it. in windows Xp, when I run the dxdiag command to view it, its 3D acceleration is unavailable, in addition, information such as the graphics card driver is unknown, and no driver is found during the driver Energy Check. Therefore, we can conclude that the configuration of ubuntu12.04 is incorrect, but I don't know where the problem is.

How can this problem be solved! Thank you ......