2 Monitors simultaneously

hbrckl — Wed, 12 Mar 2025 10:34:46 GMT

Dear Sir or Madam

I have bought a refurbished laptop and docking station as well as two new screens.
When I connect the two screens to the two DP ports of the docking station, one is displayed with 2560x1440 and the other with 1280x720 pixels. If I connect the ‘1280’ to the HDMI port of the docking station, it is displayed with 1920x1080 pixels.
If the screens are connected to the docking station with USB-C to USB 3.0, only one is displayed with 2560x1440 pixels.
Only use the supplied cables. I have installed the latest drivers for all devices from the respective Dell pages. No change. The dealer could not help either. Please help me with the installation of the screens.

I am using
Windows 11 Pro
Version 23H2
64-bit system
Memory: 16 GB RAM
Processors: Intel i5-8350U
Graphics card: Intel UHD Graphics 620
Laptop Latitude 5590, Service Tag 65HPHR2
Screen 1 P2423DE, Service Tag CN-056HDR-TV200-23K-0SHL-A00
Screen 2 P2423DE, service tag CN-056HDR-TV200-23K-0SFL-A00
Docking station WD19TBS, service tag 5NYWLM3

Yours sincerely

hbrckl

Re: 2 Monitors simultaneously

MUC — Wed, 12 Mar 2025 19:21:11 GMT

Dell P2423DE

2560 x 1440 @ 60 Hz

1 x HDMI 1.4

1 x DisplayPort 1.4

1 x DisplayPort-Out

1 x USB-C (DisplayPort 1.4)

Dell Docking Station WD19 Thunderbolt

Thunderbolt 3

2 x DisplayPort 1.4

1 x HDMI 2.0

Dell Latitude 5590

1 x USB-C with DisplayPort 1.2 (HBR2)

1 x HDMI 1.4

1 x VGA

2560 x 1440 @ 60 Hz requires just over 7 Gbps of data per monitor over the DisplayPort protocol. HBR2 offers a bandwidth of 21.6 Gbps over 4 lanes.

The only problem here is that the WD19TBS docking station connects via DisplayPort Alt Mode instead of Thunderbolt, since the laptop doesn't have Thunderbolt. This means the video signal is transmitted to the docking station at half the data rate over only 2 lanes. This is also described in the docking station manual; see page 22 (Display Resolution Table | Table 4. WD19TB for Non-Thunderbolt systems).

I would therefore try the following: Buy a USB Type-C to DisplayPort cable and connect the monitors to the laptop without the docking station as follows:

Information about this configuration with Multi Stream Transport (MST) can also be found in the monitor's manual.

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2 Monitors simultaneously

Re: 2 Monitors simultaneously