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Dual Monitor w/ MST Hub Problems (SP3)

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By surface_n1nja, Junior Member on 14th August 2014, 04:18 PM
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I came into the SP3 world after many hours researching to make sure that dual external monitors was a possibility, specifically without using USB-powered "external video cards". However, after following directions that people have posted before I have the below setup, and only one external monitor is being displayed.

System: Surface Pro 3 i7 / 8GB / 512GB SSD
Microsoft Surface Docking Station
2x HP LA2206x Monitors
StarTech Triple Head DisplayPort 1.2 Multi Monitor MST Hub
StarTech Mini-DP to DP Adapter cable

Plugged in like so:

Docking Station -> Mini-DP to DP Cable -> MST Hub -> Output 1=Monitor #1, Output 2=Monitor #2

The Surface continues displaying on its screen, and Monitor #1 gets output. Monitor #2 seems like it tries to initialize (I hear the "da-dump" sound from the Surface when it gets plugged in/unplugged) but no video output.

I have tested the MST Hub on another laptop (HP Elitebook Folio 9470m) and both external monitors display without issue. The only difference between the two setups is the Mini-DP to DP adapter cable is not required/cant be used for the setup on the 9470m, as it has a full DP port on it.

Any help would be appreciated, thanks!
 
 
14th August 2014, 07:41 PM |#2  
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Have you looked in the "Screen Resolution" control panel (right-click on the Desktop) to see if the second external monitor is shown?
Have you tried using Win+P to disable the internal display?
Have you checked Device Manager to see if both external monitors are detected correctly and have working drivers?
Have you verified that MiniDP can drive multiple displays at all?
Have you verified that MiniDP can drive the total display resolution that you're trying to run off of it?
Have you verified that the SP3's video chip can drive the total display res that you're trying to get (remember that the internal display is very high resolution)?

Those are the things I'd check first, in probably not quite that order.
14th August 2014, 07:44 PM |#3  
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Quote:
Originally Posted by GoodDayToDie

Have you looked in the "Screen Resolution" control panel (right-click on the Desktop) to see if the second external monitor is shown?
Have you tried using Win+P to disable the internal display?
Have you checked Device Manager to see if both external monitors are detected correctly and have working drivers?
Have you verified that MiniDP can drive multiple displays at all?
Have you verified that MiniDP can drive the total display resolution that you're trying to run off of it?
Have you verified that the SP3's video chip can drive the total display res that you're trying to get (remember that the internal display is very high resolution)?

Those are the things I'd check first, in probably not quite that order.

1) Second external does not appear in Screen Resolution
2) Yes, however SP3 devices support 2 external plus internal as per spec sheet
3) I will check this.
4) As per SP3 and DisplayPort 1.2 spec sheet, yes
5) As per SP3 and DisplayPort 1.2 spec sheet, yes
6) It is listed on official documents as an advertised feature for 2 external as well as the internal
15th August 2014, 01:30 AM |#4  
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For #6 I was specifically asking whether it could drive that much resolution, rather than whether two externals was possible at all (you might try reducing the res on the external panel and seeing if the second wakes up). You should also make sure that your hardware all works; try things like disconnecting the first monitor and making sure the second works when plugged in (leave it in the same spot on the hub?)

Beyond that... do you have a Microsoft store nearby? Even if not, you can try calling their support people. If nothing else indicates the source of the problem, it's probably the sort of thing you should take to the people who are paid to deal with such issues.
4th September 2014, 08:32 PM |#5  
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Working an issue similar to this now. Trying to use a two Dell U2414H monitors with DisplayPort 1.2 chaining, and a DP Hub. Both end in the same result as you.

Sometimes I'm able to "trick it" and get it working but after a reboot or shutdown the 2nd monitor goes back to disabled and I have to repeat the process. Right now I have it working using one monitor on the mini-DP, and the other on a USB-3 to DP adapter.

Working Microsoft on this issue. They claim there is a KB out for a problem with the dock (2992365) but I haven't been able to pull anything up using that number online.
5th September 2014, 07:43 PM |#6  
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I didn't have any luck with a MST hub either. I ended up just getting a USB video card adapter and I'm now using my SP3 as my primary work machine with two monitors.
26th August 2015, 06:27 AM |#7  
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Try it without the dock plugging directly into the dp port on the surface
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