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UnToha

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May 17th, 2024 20:29

P2418HT, USB extender, Touch working on one

I got two P2418HT connected to one USB extender. Somehow, the built-in USB hub only works in one of those monitors. So, touch function also works only on one of those. And I can see only one HID compliant touch screen in the Device Manager. If I connect only one monitor to the extender, than it works ok, no matter which monitor I connect. So it's not an issue of touch, or built-in USB hub. 

If I connect second monitor to the left side USB port of the first monitor, it doesn't work too. So daisy chaining USB doesn't work as well.

If I get another USB extender and connect each of the monitors to their respective USB extender, then everything is ok, I can see two HID-compliant touch screen devices in the Device Manager. 

So, is there any way to make two P2418HT monitors share one USB extender?

DELL-Chris M

Community Manager

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54.4K Posts

May 19th, 2024 12:23

A USB extender was never tested by Dell.

The P2418HT never supported daisy chaining.

Monitor daisy chaining only works if the 1st monitor has either a USB-C video port or the DP out port to connect to the 2nd monitor DP in port.

Each of the P2418HT #6 USB-B upstream ports (P2418HT User's Guide, page 9) must each be connected to the USB extender via the provided USB-B to USB-A cables (page 6).

UnToha

1 Rookie

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2 Posts

19-05-2024 15:46 PM

@DELL-Chris M​ Thanks a lot for your answer.
Saying "daisy-chaining USB" I mean I'm daisy-chaining only USB and not a video signal. Both monitors HDMI inputs are connected to the PC directly. So there is no daisy-chaining for video signal.

I simply tried to connect the second monitor #6 USB-B upstream port (P2418HT User's Guide, page 9) to the USB 3.0 downstream port (page 8) of the first monitor. It didn't help to make touch feature on the second monitor work. Although it looks strange because we should be able to daisy-chain USB hubs, right?

And I tried this only because connecting each of the P2418HT #6 USB-B upstream ports (P2418HT User's Guide, page 9) via the provided USB-B to USB-A cables (page 6) to the one single USB extender (with enough USB ports, of course) I can't get touch feature working on both monitors. It works only on one of those. And I see in Windows Device Manager that only one HID-compliant touch screen exists in this situation. 

I guess, I could have this problem solved just by adding another USB extender for the second monitor. But I would prefer to have just one box on the desk.

DELL-Chris M

Community Manager

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54.4K Posts

May 20th, 2024 11:07

"Although it looks strange because we should be able to daisy-chain USB hubs, right?"
I have never seen any Dell monitor documentation that states if that is possible.

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