Dell U4021QW User Manual page 75

Problem What you
experience
Monitor Displayed
displayed image image not at
at 2560 x 1080 5120 x 2160 @
@ 60Hz 30Hz/60Hz
due to duplicate
mode
Monitor Displayed image
displayed not at 5120
image not at x 2160 when
5120x2160 connected to
docking device
Black screen on Black screen
Chrome OS @ after switch
HDMI port on PBP mode
80/20
No Display No Display
or USB not or USB not
working working on
Windows 7
Enter BIOS Unable to goto
setup menu @ BIOS setup
HDMI port menu
Black screen on Switch to PBP
PBP mode @ 80/20 mode no
HDMI displayed image
@ HDMI when
connected to
Docking device
Display image at Not able to
5120 x 2160 @ select 5120
30 Hz at HDMI x 2160 @ 60
port Hz in Graphic
Control Panel at
HDMI Port
Possible solutions
• Press "Windows" + "P" key, select either "Extend
Mode" or "second screen only".
• Goto Display setting, select 5120x2160.
• To support 5120x2160, check whether docking
device meet either one of the following:
1. DP1.2 or higher
2. Type-C Alt Mode DP1.2 or higher
3. HDMI 2.0
• Graphic Card Driver not able to support
resolution 4096 x 2160.
• Switch to PBP 75/25 or 50/50
• Windows 7 not support. Switch to Windows 10.
• unplug the HDMI cable or disconnect the
monitor
• Some docking device do not support 80/20
(4096 x 2160) resolution.
• Switch PBP mode to 75/25 or 50/50
• Plug/unplug HDMI cable
• Change input source to DP port
• Due to legacy platform HDMI 2.0 HW bandwidth
limitation, it can only support 5120 x 2160 @ 30
Hz.
• Switch to DP 1.2 or higher
Troubleshooting | 75