Chapter 4. Working with the dock
This chapter provides information about the video output function of the dock and instructions on how to
work with the dock utility, which enables you to configure the dock to your needs.
Identifying your monitors
If you are simultaneously connecting two external monitors to your notebook computer using the dock, click
the ThinkPad USB 3.0 Dock icon in the Windows notification area, and you might see menus named as 2.
ThinkPad USB 3.0 Dock or 4. ThinkPad USB 3.0 Dock. The serial numbers at the beginning of the menus
are automatically and randomly assigned by the Windows operating system, which can help you match the
menus with the corresponding monitors. Select the monitor that you want to configure, and then you can
configure the color quality, the screen rotation, the screen resolution, and the video output modes for the
selected monitor through the submenu options under the corresponding menu. Before doing any monitor
configuration, you need to firstly identify your monitors.
To identify your monitors, do the following:
1. Click the ThinkPad USB 3.0 Dock icon in the Windows notification area. A pop-up menu opens.
2. Select Video Setup. A window opens.
3. Right-click the monitor number icon as you want in the top panel, and then select Identify. The selected
monitor number is displayed on the corresponding monitor screen. If you want to identify all monitors
at a time, depending on the operating system you are using, click Identify or Identify all in the top
right corner of the window.
Understanding the video output modes
The dock works in the following three video output modes:
"Extend mode" on page 11
"Mirror mode" on page 12
"Single-display mode" on page 12
By default, the dock works in extend mode.
When the dock is in extend mode, it splits your display across multiple monitors.
There are three options when you are using extend mode:
• Extend: When you select this option, your notebook computer monitor becomes the primary display
and the external monitor(s) become the secondary display(s), and the external monitor display(s) are on
the right side of the notebook computer monitor display by default.
• Extend To: When you select this option, your notebook computer monitor becomes the primary display
and the external monitor(s) become the secondary display(s). You can give each monitor its own frame
buffer through the submenu options Right, Left, Above, and Below or through drag operations. The
display space is a continuous area; therefore, windows and objects can be moved between different
displays, or even straddled across multiple displays.
• Set as Main Monitor: When you select this option, the external monitor(s) become the primary display(s)
and the notebook computer monitor becomes the secondary display.
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