Windows 10: when attaching 2nd monitor, both screens change to right50% of desktop

Discus and support when attaching 2nd monitor, both screens change to right50% of desktop in Windows 10 Graphic Cards to solve the problem; I have a Dell laptop (running Windows 10), a Targus docking station, an old LG monitor that I'm trying to replace, and a new AOC monitor that I want to... Discussion in 'Windows 10 Graphic Cards' started by bennetthaselton, Jan 26, 2017.

  1. when attaching 2nd monitor, both screens change to right50% of desktop


    I have a Dell laptop (running Windows 10), a Targus docking station, an old LG monitor that I'm trying to replace, and a new AOC monitor that I want to use instead. I am trying to attach the AOC monitor directly to the HDMI port on the laptop, since the monitor screen doesn't display as smoothly when it's connected to the docking station. The trouble is that when (and only when) the laptop is attached to the docking station, if I then plug the AOC monitor into the HDMI port on the laptop, both the laptop screen and the AOC screen switch over to showing the rightmost 50% of a Windows desktop:


    when attaching 2nd monitor, both screens change to right50% of desktop [​IMG]


    This isn't usable, because when I open new apps, even though I can see their icon on the taskbar, the app has opened in the left-hand 50% of the desktop, which is not displayed on either screen. I know there is a "hidden half" of the desktop off to the left, because I can move the mouse pointer off of the left border of the screen(s), and then I have to drag the mouse pointer back by an equal amount before it becomes visible again.

    Now, when the laptop is not connected to the docking station, everything works as expected. I can connect either the LG monitor or the AOC monitor directly to the laptop, and I can go into Display settings and choose to duplicate the screens, or extend the desktop across both screens, and all options work as they're supposed to. Here is the desktop duplicated across the laptop screen and the LG monitor:



    when attaching 2nd monitor, both screens change to right50% of desktop [​IMG]


    and here it is duplicated across the laptop screen and the AOC monitor:

    when attaching 2nd monitor, both screens change to right50% of desktop [​IMG]


    But, as soon as I connect the Targus docking station, the laptop only works correctly with the LG monitor. Here it is with the LG monitor connected, and the desktop nicely duplicated between the laptop screen and the LG screen:

    when attaching 2nd monitor, both screens change to right50% of desktop [​IMG]


    However, as soon as I connect the AOC monitor instead, I get both screens showing the right-50% of the desktop, as shown in the very first picture.

    How do I prevent that?

    I do know that the laptop seems to count the Targus docking station as a "screen" (presumably because the Targus has a DVI connector on it). When nothing is connected to the laptop, Display settings shows 1 screen. When the Targus is connected, Display settings shows screens "1" and "2". And then when the LG monitor is connected, the laptop screen and the LG monitor become 1 and 2, while the Targus gets bumped down to 3. But, regardless, that still doesn't explain why the laptop is showing the rightmost-50% as soon as the AOC gets connected to it, and why this doesn't happen with the LG monitor.

    The only other difference is that the LG monitor (the one that works) has a DVI connector which is then connected via a DVI-to-HDMI converter to the HDMI port on the laptop, whereas the AOC monitor (the one that's acting screwy) is connected via an HDMI connector straight to the laptop. Don't know if that affects anything.

    :)
     
    bennetthaselton, Jan 26, 2017
    #1
  2. MAK_28211 Win User

    2nd Monitor on HDMI port not working on Dell 8900

    Hi, I have updated the driver. I have read & followed Andre Da Costa article.

    Summary of my problem.

    I connect the 2nd monitor to the HDMI port

    The 2nd monitor will turn on and establish connectivity with the computer

    I am able to extend my desk top screen.

    But, after leaving my desktop for an hour ( I do not have a laptop) both the desk top monitor and the 2nd monitor will go into sleep mode and will not wake up.

    I have to disconnect the 2nd Monitor from the HDMI port

    Then reboot my system.

    Then reconnect the 2nd monitor

    Any ideas on how to resolve this issue?

    thank you

    Mak
     
    MAK_28211, Jan 26, 2017
    #2
  3. Shojie Win User
    Icon/Desktop Alignment Issues

    Specs: Dual monitors (both the same model ViewSonic LED 1080P HD), Radean R9 390 Series, Windows 10 Pro 64-bit, Intel i7-3770, 16 Gigs RAM

    Issue: Happened after an update a few weeks back (maybe 3 - 4 weeks ago)

    (see attached image)


    when attaching 2nd monitor, both screens change to right50% of desktop [​IMG]


    Windows desktop is aligned perfectly on both monitors. My left monitor (main) after the one update, decided to shift my icons about 1/3rd of the way down the screen (this is the normal alignment to the icons as if they where at the top of the screen).
    if I put my icons back to the top of the screen and reboot they are back down as seen in the above image.

    If I change my 2nd monitor to my main the icons are exactly where they belong at the top of the screen. Also if I pass a windows from main monitor (left) to the 2nd monitor (on right), the window becomes out of wack and the monitors seem off alignment. (see
    2nd image)


    when attaching 2nd monitor, both screens change to right50% of desktop [​IMG]


    I've tried to google but only get where the icons aren't saving position, this is something a bit different. Does anyone have any suggestions please?
     
    Shojie, Jan 26, 2017
    #3
  4. when attaching 2nd monitor, both screens change to right50% of desktop

    Weird things can happen In duplicate mode with two different resolution Monitors on the same GPU. Connecting the display to the HDMI on the laptop connects them both to the laptops GPU. When connected to the docking station the second monitor is on a USB feed GPU, a second GPU. best guess anyway. What happens if you switch to extend? Windows Logo key *Start + P > Extend.
     
    alphanumeric, Jan 26, 2017
    #4
  5. Thanks, this did help fix it! When I connected the new monitor and got both screens showing the rightmost 50% of the desktop, I just hit windows-P and the menu appeared (since it appears by default on the right-hand side of the screen, that meant of course it was part of the 50% of the desktop that I could see). And from there I could edit display settings and get it fixed.
     
    bennetthaselton, Jan 30, 2017
    #5
  6. I like that word fixed. *Biggrin
     
    alphanumeric, Apr 5, 2018
    #6
Thema:

when attaching 2nd monitor, both screens change to right50% of desktop

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