User Guide

Connect to an external display

Connect your computer to a projector or a monitor to give presentations or expand your workspace.

Connect to a wired display

1. Connect the external display to an appropriate video connector on your computer, such as the HDMI

connector, USB-C connector (USB 3.1 Gen 1), or Thunderbolt 3 connector (USB-C).

2. Connect the external display to an electrical outlet.

3. Turn on the external display.

If your computer cannot detect the external display, right-click a blank area on the desktop, and then click

Display settings ➙ Detect.

Do not connect external displays to the USB-C connector (USB 3.1 Gen 1)

1 and the HDMI connector 2 at

the same time. Otherwise, only the external display connected to the USB-C connector (USB 3.1 Gen 1)

will work by default. To change the priority between the USB-C connector (USB 3.1 Gen 1) and the HDMI

connector, you can change the priority between the USB-C connector (USB 3.1 Gen 1) and the HDMI

connector from the UEFI BIOS menu. To enter the UEFI BIOS menu, see “Enter the UEFI BIOS menu” on

page 43, and then select Display ➙ Shared Display Priority. Then, follow the instructions on the screen.

Supported resolution

The following table lists the supported maximum resolution of the external display.

Connect the external display to Supported resolution

the USB-C connector (USB 3.1 Gen 1) Up to: 4096 x 2304 pixels / 60 Hz

the Thunderbolt 3 connector (USB-C) Up to: 4096 x 2304 pixels / 60 Hz

the HDMI connector

Up to: 4096 x 2160 pixels / 30 Hz

Connect to a wireless display

To use a wireless display, ensure that both your computer and the external display support the Miracast

feature.

• Open the Start menu, and then click Settings ➙ Devices ➙ Bluetooth & other devices ➙ Add

Bluetooth or other device. In the Add a device window, click Wireless display or dock. Then, follow the

instructions on the screen.

• Click the action center icon

in the Windows notification area and click Connect. Select the wireless

display and follow the on-screen instructions.

Set the display mode

Press

or and then select a display mode of your preference.

T490s and X390 User Guide