Selectable Resolutions differ on identical monitors

[XpeLab]

These monitor are identical but on one of them I can't select 3840x2160 Resolution. Display 1 is laptop native monitor.

All Drivers/Windows Update/Vendor Update are fully updated.

How do I resolve this?

System

Device name PIAB-941941
Processor 13th Gen Intel(R) Core(TM) i7-1360P 2.20 GHz
Installed RAM 16.0 GB (15.7 GB usable)
Device ID 6140D7C8-D381-4B83-AF0D-EB711383DD0A
Product ID 00330-80000-00000-AA717
System type 64-bit operating system, x64-based processor
Pen and touch No pen or touch input is available for this display

Edition Windows 11 Enterprise
Version 23H2
Installed on ‎5/‎10/‎2024
OS build 22631.4037
Experience Windows Feature Experience Pack 1000.22700.1027.0

Display 2

Display 3

Device manager

Both monitors are connected with DisplayPort.
Monitor settings are identical.

[MUC]

The monitors are:

Wortmann Terra LED 3290W, 31.5"
3840 x 2160 @ 60 Hz 10-bit HDR

Please include the sales name of the laptop. This is usually on a label on the bottom. If you have a link to the product, please add it. And please include information about the cables used. I don't know of any laptops with DisplayPort connectors, so there must be something in between.

Please run the Intel System Support Utility for Windows and perform a scan for all options. Attach the output file here.

Please also create a Report for Intel Graphics Drivers and attach the file here.

[XpeLab]

I don't know what kind of information about the cables your are requesting? Length? Make or Brand?
Monitor images also attached un-cropped.

Laptop MSInfo32:

Docking station model: Device on Dell

Docking station connections:

Monitors

[XpeLab]

I've saved the reports you asked for in previous post, I think you should have all you asked for now, yes?

Thank you

[MUC]

Thanks for the information.

The laptop is a Dell Precision 3480 and the docking station is a Dell WD19S.

The docking station is connected to the Dell laptop on the left side via one of the Thunderbolt 4 (USB Type-C) ports. This can output a signal in accordance with the DisplayPort 1.4a HBR3 protocol using 4 lanes. But the user manual for the Dell docking station states:

HBR3 on 4 lanes = 32.4 Gbps

HBR3 on 2 lanes = 16.2 Gbps

Coordinated Video Timing - Reduced Blanking (CVT-RB), 8-bit:

1. 3840 x 2160 @ 60 Hz = 16 Gbps
2. 3840 x 2160 @ 30 Hz = 7.8 Gbps
3. 2560 x 1440 @ 60 Hz = 7.3 Gbps
4. 1920 x 1080 @ 60 Hz = 4.1 Gbps

Now you have B+D = 11.9 Gbps

C+C as stated in the manual = 14.6 Gbps

B+B = 15.6 Gbps (too close)

The Dell docking station is a bottleneck.

Possible solutions to run both monitors with the same resolution:

• Reduce the resolution on both screens to the resolution that Dell states is the maximum supported (2560 x 1440)
• For 3840 x 2160 @ 60 Hz on both monitors connect one of the two monitors via HDMI directly to the HDMI port on the right side of the laptop using a Premium High Speed HDMI Cable.

[MUC · Accepted solution]

Addendum: After analyzing the extended diagnostic data of the graphics driver, I can say that the Wortmann monitor does not support a resolution of 2560 x 1440. Therefore, please try the variant with the HDMI cable.

[MUC]

For maximum convenience, you can also consider upgrading the Dell docking station to the WD22TB4 model ("Dell Thunderbolt Dock").

Then you can operate both monitors at 4K @ 60 Hz via the docking station's DisplayPorts and only need to connect one cable to the laptop.

[XpeLab]

Thank you so much for your very detailed answer.

It really helped the customer.