Dell U4021QW User Manual page 76

Problem
Monitor
displayed image
at 3840 x 2160
@ 60 Hz
Monitor displays
image at 3840
x 2160 @ 60 Hz
when using Intel
Graphic Card
Monitor display
image at 5120 x
2160 @ 30Hz
when
connected to
Intel Graphic
Card via TBT
port
No image
when using
Thunderbolt
TM
3 connection
to computer,
laptop, and so
on
76 | Troubleshooting
What you Possible solutions
experience
Not able to • Due to legacy platform HW limitation, it does not
select 5120 x
2160 in Graphic • To support 5120 x 2160 @ 60 Hz, check whether
Control Panel
Not able to • Intel Graphic Driver has disabled 5K Mode
select 5120
x 2160 @ 60 • Install/Re-install Intel Graphic driver after v.7925
Hz with: Intel
CPU Gen10 or
lower, and Intel
Graphic Driver
x.7584 onward.
Not able to • Due to legacy Intel CPU bandwidth limitation.
• Inte CPU 10th (Ice Lake) or Gen 11th (Tiger
select 5120
x 2160 @
60 Hz
Black screen • Verify if the Thunderbolt
• Verify if the device required more than 90 W
• Thunderbolt
• Set Windows to Projection mode.
• Ensure that the Thunderbolt
support 5120 x 2160.
the platform meet either one of the following:
1. DP1.2 or higher.
2. Type-C Alt Mode DP1.2 or higher.
3. HDMI 2.0.
Support from V7584 to 7916.
or higher.
Lake) or later CPU (DP 1.4) can support 5120 x
2160 @ 60 Hz.
device can support DP alternate mode.
power charging.
interface of device cannot
TM
support DP alternate mode.
active cable is not damaged.
interface of the
TM
4 (USB Type-C)
TM