Core i5 10210U with dual monitor 2560 x 1440 possible?

[tulenimama]

Hi.

I have connected second monitor to laptop DELL Latitude 3510 with CPU Core i5 10210U and only one of them is able to run with 2560 x 1440 resolution. The new one offers max 1024 px. I have tried to switch cables, update all the drivers. Both monitors are connected through dock WD19, both DP (I also tried DP x HDMI combination).

Does this CPU support dual monitor with 2560 x 1440? Or I should search for bottleneck on dock's side?

Thank you very much!

[MUC]

The following technical data can be found in the appendix:

[5] = USB 3.2 Gen 1 Type-C port with DisplayPort 1.2 Alt mode. Number of display supported: Up to three displays supported via DisplayPort Multi Streaming Technology.

So connecting both monitors to the dock via DisplayPort is definitely correct. A maximum video bandwidth of 21.6 Gbps is available via the HBR2 protocol.

2560 x 1440 @ 60 Hz RGB 8-bit = 7.34 Gbps = 34% HBR2

So the bandwidth should be sufficient for 2 screens with this resolution @ 68% HBR2 Multi Stream Transport (MST).

Since you have full Dell equipment, please use the Dell graphics driver and the latest firmware for the WD19 dock:

• Dell UHD Graphics Driver 31.0.101.2125, A05, released May 13, 2024
• Dell Dock WD19 Firmware Update Utility

If this does not help, I‘d recommend contacting Dell Support with reference to this thread.

[MUC · Accepted solution]

I found this passage in the dock's manual.

According to this, only 2 lanes are available for HBR2 instead of 4. Unfortunately, this reduces the available bandwidth calculated above by half. If you want to operate both monitors at the same time, you can unfortunately only achieve Full HD 1920 x 1080 @ 60 Hz.

The WD19 dock actually seems to be the bottleneck.

[tulenimama]

I would like to thank you for help - CPU is definitely not the issue but even if I try to set monitor nr. 1 on lower resolution there no chance to set other monitor to full hd. So I will try to contact DELL support according to possible dock issue.

Thank you once again.