Lenovo ThinkPad T520 User Manual page 99

10. Click the Driver tab.
11. Click Update Driver. The Hardware Update Wizard appears.
12. Click No, not this time, and then click Next.
13. Select Install from a list or specific location (Advanced), and then click Next.
14. Select Don't search. I will choose the driver to install, and then click Next.
15. Clear the Show compatible hardware check box.
16. Select Manufacturer and Model for your monitor. If you cannot find your monitor in the list, stop the
installation of this driver and use the driver shipped with your monitor.
17. After updating the driver, click OK to close the Properties window.
18. Set Colors and Screen area in the Display Properties window.
19. Click OK.
Considerations for attaching an external monitor
• When installing an operating system, you must install the display driver for your monitor that is supplied
with the computer, and the Monitor INF file that is supplied with the external monitor.
• If you set a resolution higher than the resolution you are using on the panel, and use a panel that does not
support that resolution, take advantage of the virtual screen function, which enables you to display only a
part of the high-resolution screen image your computer produces. You can see other parts of the image
by moving the screen with the TrackPoint or other pointing device.
• If the external monitor you are using is outdated, the resolution and the refresh rate may be limited.
• As for ThinkPad W520 models, the CRT connector does not work in the DOS environment at NVIDIA
Optimus mode or Integrated Graphics mode, you need to change to Discrete Graphics mode to turn on
the CRT monitor. If there is no display to change the ThinkPad Setup setting, press F7 to switch to
the Discrete Graphics mode right after power-on.
Using the DVI monitor
If your computer has one of the optional expansion units, a ThinkPad Mini Dock Plus Series 3, a ThinkPad
Mini Dock Series 3, or a ThinkPad Mini Dock Plus Series 3 (170 W), you can use the Digital Visual Interface
(DVI) monitor through the DVI connector of that unit.
Notes:
• The screen mode that can be used depends on the specifications of the DVI monitor.
• Before you attach the DVI monitor, make sure that the computer is attached to the expansion unit and
the system works properly.
To attach the DVI monitor, do as follows:
1. Turn off the computer.
2. Connect the DVI monitor to the DVI connector of the expansion unit, and then connect the monitor
to an electrical outlet.
3. Turn on the DVI monitor and the computer. The system starts.
If the computer output does not appear on the DVI monitor, do as follows:
For a computer that supports NVIDIA Optimus Graphics:
1. Switch the Graphics Processing Unit (GPU) to High Performance Graphics. For more information about
GPU switching, refer to the help for ThinkPad Power Manager.
Note: If your computer is running Windows XP, you cannot switch the GPU.
2. Right-click on the desktop and select NVIDIA Control Panel. The NVIDIA Control Panel opens.
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Chapter 2 Using your computer
81