W10 not detecting 2 monitors, so cannot extend the screen?

  1. Posts : 3
    Windows 10

    W10 not detecting 2 monitors, so cannot extend the screen?

    Hello everyone,

    Due to the Coronavirus, I'm working from home indefinitely now. I would like to work using two monitor screens as I do in the office, but I'm unable to work out how.

    I have a laptop and 2 monitors. I have only 1 HDMI port in my laptop, so bought a HDMI splitter and have separate HDMI leads from the splitter into each monitor.

    It works in the sense that I am typing on my laptop now, and I can see my two monitors with the same display as my laptop currently. The issue comes when I want to extend the screens (i.e. close my laptop, and use two screens only. Left monitor being primary, and right monitor being secondary).

    When I try to extend screens, it keeps my laptop screen as Screen 1, and then classes both of my monitors as screen 2. There is no screen 3, even though I am technically using 3 screens (laptop and 2 monitors).

    I've spent hours trying to work this now; is anybody able to advise how I can work use one monitor as primary, one as secondary with screen extended, and the laptop screen effectively being off?

    I've been into device manager, and ensured my display adaptors are up to date as well.

    Thank you so much in advance :)
      My Computer

  2. Posts : 1,286

    USB splitter? No good.

    What other ports do you have on your laptop?
    Do you have HDMI jacks? Or Display Port jacks?
      My Computer

  3. Posts : 3
    Windows 10
    Thread Starter

    Oh, sorry. I meant HDMI splitter, not USB splitter. I'm using a HDMI splitter. I've edited original post
      My Computer

  4. Posts : 1,286

    Same answer.
    HDMI splitter? No good.
    Splitting HDMI just means you can watch the same picture on two screens.

    If you want the two monitors to display different things then you need a graphics card that is dual-head (or more) and has two (or more) HDMI output connections. You said you have only one.

    Or ... if you have a display port connection ... that is "splittable" because it can carry multiple video signals. Do you have a display port jack?

    It would help if you specified the make and model of your laptop.

    Also ... what do you see in the Display settings panel?
      My Computer

  5. Posts : 3
    Windows 10
    Thread Starter

    Thanks again for your reply.

    The laptop definitely can do dual screening, as I took my laptop home from the office where i was using it with two monitors (obviously didn't check how it was hooked up to the monitors before I took it home though).
    However in the office it was in a docking station, which I don't have at home, hopefully that doesn't make a difference.

    It is a HP Elitebook 840 G5. It has an Intel I7 processor.

    I found the port information:

    1 Thunderbolt™ (USB Type-C™ connector)
    2 USB 3.1 Gen 1 (1 charging)
    1 HDMI 1.4b
    1 RJ-45
    1 docking connector
    1 headphone/microphone combo
    1 AC power

      My Computer

  6. alphanumeric's Avatar
    Posts : 14,087
    Windows 10 IoT

    Yes you can do dual screens. One will be the built in screen and the other will be the HDMI port.
    The spliter just sends the same signal to two monitors. They will mirror each other. As far as the laptop and Windows is concerned there is only one monitor connected to that HDMI port.
    I run dual monitors on my laptop. One is the built in display and the second is a USB Display Link. I could likely run dual external monitors, one on the laptops HDMI and the USB one. I would have to run in + P second screen only mode to do it though. Maybe?
      My Computer


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