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10129
December 8th, 2021 06:00
Extended display option for multiple monitors not working with WDTBS docking station
I have recently purchased the DELL WDTBS docking station for my xps 9575 laptop.
The 2 monitors I am using: P2421DC
Issue is that I cannot get both monitors to work in extended display.
The only way I have managed to get both monitors working via the docking station is via MST, but that does not support an extended display.
Currently I have both monitors plugged in via the 2 Display Ports in the docking station, however only 1 monitor is detected.
Further to mention I have already installed the appropriate recommended driver updates.
Having read up on the knowledge base I still cannot find the solution.
Please help me out.
Thansk in advance
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jphughan
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14K Posts
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December 8th, 2021 08:00
@AM92 You say you tried "both options", but I suggested trying the DP outputs individually, trying an HDMI output, and trying one or both USB-C outputs on the back of the dock, either individually or while another display is connected to another output. I also suggested verifying that MST was enabled in the settings of the displays themselves. So when you say "both options", I don't know what you actually tried. As a general bit of advice, the more specific you can be about exactly what you're doing, the more likely you'll be able to get helpful responses.
The WD15 when paired with your system would not have enough bandwidth to run dual 1440p 60 Hz displays. It would only run dual 1080p 60 Hz or single 1440p 60 Hz. The WD15 is also a regular USB-C dock, not a Thunderbolt dock like the WD19TBS. And on the XPS 15 9575, only the USB-C ports on the left side support Thunderbolt. The ports on the right only support regular USB-C. The WD19TBS will operate in USB-C backward compatibility mode, but only at reduced functionality equivalent to the WD15. So if you're using ports on the right and can only get a single 1440p 60 Hz display running, that's probably why. Getting the WD19TBS connected to a Thunderbolt port on your system would allow it to tap into 4x more video bandwidth than running it in regular USB-C mode as it sounds like you're doing.
But if the ports on the left aren't working, then I'm not sure what to tell you. Does the dock show up in the Thunderbolt application? Do you have your Thunderbolt drivers installed? Are you running the latest system BIOS and TB3 controller firmware? Is the dock running the latest firmware? If you can't get the dock to work at all on your Thunderbolt ports, there may be a hardware problem with your system.
I seriously doubt Windows 11 is relevant here. Despite the name change, Windows 11 is not much more than a new feature release of Windows 10. The fact that it the dock may not have been officially certified for Windows 11 doesn't mean it wouldn't work. And if mass failures WD19TBS were occurring as users updated to Windows 11, I would expect we'd have heard about it by now.
jphughan
9 Legend
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14K Posts
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December 8th, 2021 07:00
@AM92 MST definitely does support extended displays. That is the entire point of MST. If you only get mirrored output, that's because you have an MST cabling setup without actual MST support available, typically caused by MST being disabled in the display settings or having some component in the chain that doesn't support MST. But I have personally run daisy chained displays from a WD19TBS and used Extend mode. So if you only got mirrored output, make sure MST is actually enabled on both of the displays in their on-screen menus. It may be disabled by default.
Otherwise, have you tested whether each of the DP outputs on the WD19TBS work separately, i.e. by having a display connected ONLY to DP1 and then ONLY to DP2? It would help to determine whether this is an issue running dual displays or whether there might just be a problem with one of the DP outputs on that dock. Have you tried any other outputs? The WD19TBS has an HDMI output and the P2421DC has an HDMI input, so if you have a regular HDMI cable lying around, that would be a simple test. In fact the P2421DC has a USB-C input and comes with a USB-C cable, and the WD19TBS has TWO video-capable USB-C ports on the back. So you could try that too.
AM92
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3 Posts
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December 8th, 2021 08:00
I have tried both options and nothing provides a solution.
I have also seen now that this docking station does not support Windows 11. So that seems to be the issue. Thoughts?
Further to note, I have used the same laptop with WD15 docking station, plugged in to the main charging port on the laptop (first port on the left from the back) and that was a simple connection that enabled the docking station to work effortlessly.
1 Screen when plugged in to WDTBS docking station only works when plugged in to the specific display ports section in this laptop on the right side and lights up only there.
AM92
1 Rookie
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3 Posts
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December 9th, 2021 00:00
Thanks for your help! It seemed to have been an outdated thunderbolt driver which was causing the issue. Now all working solid.
DELL-Cares
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27.4K Posts
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December 13th, 2021 03:00
Greetings,
I'm Kughalu, one of the Supervisors at Dell Social Media Support. I’m writing to you regarding the interaction you had with my team.
Jimson brought this case to my attention and I reviewed the details. Firstly, I'm sorry for the inconvenience you had gone through. I see there was an issue with extended display, and my associate had assisted you. I hope, we've been able to address the issue to your satisfaction. Should you require any further assistance in the future, feel free to reach out to us.
Lastly, are you happy with the support received from my team so far? Do you have any feedback for us?
Best Regards
Kughalu
Supervisor
Dell Social Media Team