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Dell Lattitude 5490 with two Dell U2518D monitors
Hello!
I`m trying to connect two Dell monitors to my 5490 laptop. Laptop has only 1 HDMI connector. I`ve connected first monitor to the laptop via HDMI, second monitor to the first monitor via DP-out(on the first one) and mDP-in (on the second). Laptop runs Windows X and can`t detect the second monitor, the second monitor shows message that there`s no signal from mDP device. Is there any possibility to connect both monitors to the laptop?
Dell-Alan D
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April 15th, 2019 06:00
Hi @Micahel_GMV ,
The following article explains daisy chaining monitors and how it works - https://www.dell.com/support/article/uk/en/ukbsdt1/sln293813/how-to-daisy-chain-multiple-monitors-using-displayport-multi-stream-transport-mst?lang=en
The system requires an MST supported DisplayPort connector on the motherboard in order for daisy chaining to function. As your system has HDMI rather than DisplayPort, this functionality is not there.
The only other way to get dual display on the system would be via a docking station or some sort of display type adaptor to convert VGA to miniDP or DisplayPort. The latter I can't guarantee compatibility with the system.
Alan
Dell-Alan D
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April 15th, 2019 07:00
My apologies for the oversight, here is the cable you require that @jphughan suggests. It should work no problem with this cable -https://www.dell.com/en-ie/shop/dell-adaptor-usb-c-to-displayport/apd/470-acfc/tvs-home-theater
Alan
jphughan
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April 15th, 2019 07:00
@Dell-Alan Dthe system's USB-C output provides a DisplayPort signal. The system specs even say "DisplayPort over USB Type-C". And since all DisplayPort over USB-C is always at least DisplayPort 1.2, MST is supported. If that weren't the case, then this system wouldn't be able to drive multiple displays through USB-C docks that tap into the native GPU output wired to that port, such as the WD15. Also, converting VGA to MiniDP or DisplayPort isn't even possible. A DisplayPort signal can be converted to HDMI, DVI, and VGA, but no other signal types can be converted to DisplayPort (and MiniDP is the same signal carried over a different connector).
@Micahel_GMVsee my post above. You just need a different cable for the first display and you'll be good to go.
jphughan
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April 15th, 2019 07:00
DisplayPort daisy chaining requires you to use DisplayPort for the entire chain. Get a USB-C to DisplayPort cable to connect the first display instead of using HDMI and it will work. I use my Latitude 7480 connected to a pair of Dell U2717D QHD displays this way and it works perfectly.
jphughan
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April 15th, 2019 07:00
That link is from the Ireland store, and that adapter is pretty egregiously priced in my opinion, especially since it's an adapter that still requires a DisplayPort cable rather than a full cable. @Micahel_GMV if you're in the US, here is the cable I bought.
Micahel_GMV
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April 15th, 2019 08:00
jphughan
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April 15th, 2019 11:00
@Micahel_GMV happy to help! Also be aware that you might have to manually enable DisplayPort MST on the first display in the chain before it will actually pass a signal through its DisplayPort output. That option is shown on Page 40 of the U2518D manual here, although it's not clear whether it's on or off by default.