Windows 8 and 8.1 Forums


cannot extend desktop on 2 monitors 8.1 64bit. ok in 32bit

  1. #1


    Posts : 9
    Windows 8.1 64bit

    cannot extend desktop on 2 monitors 8.1 64bit. ok in 32bit


    I used to have my computer running Windows 8.1 32bit (upgraded from Win XP Pro) and both my monitors were working great with an extended desktop.
    After a hard drive problem (replaced the HD), I managed to get Windows 8.1 64bit installed (after a very long and involved and difficult route now that XP is no longer supported) but both my monitors now show the same image.

    Samsung 710N (recommended resolution 12080 x 1024) connected via VGA cable
    LG Flatron E2240V -PN (recommended resolution 1920 x 1080) connected via HDMI cable

    I have managed to change the monitor driver from Windows generic Microsoft Basic display to LG E2240V (HDMI).

    But I cannot get Windows to see a second monitor as a different monitor. When I click on Detect under Display in the Control Panel, it does nothing. When I click on identify, both my monitors display a 1.

    I have tried:
    * Windows 8.1 Can't do an "Extend Display"
    * unpluging each monitor in turn from the computer and from power and waiting a couple of minutes then plugging in and booting up.
    * Unpluging each monitor in turn from the computer and from power and waiting a couple of minutes then plugging in again while Windows was running.
    * Doing a full shutdown before restarting to see if Windows would pick up both monitors
    * Looking for new drivers from Samsung's website and LG's website.
    * Trying to install drivers that were not specifically designed for Windows 8.

    What else can I try?

    Forgot to say - just using onboard graphics. Motherboard is Gigabyte 880GA-UD3H

      My System SpecsSystem Spec

  2. #2


    Sydney, Nova Scotia, Canada
    Posts : 6,490
    Windows 10 Education 64 Bit


    "I managed to get Windows 8.1 64bit installed (after a very long and involved and difficult route now that XP is no longer supported)" <<< Why was it so difficult? How did you do the install of 64 bit 8.1?
      My System SpecsSystem Spec

  3. #3


    Looking for new drivers from Samsung's website and LG's website.
    Don't worry about monitor drivers - there really is no such thing as "monitor drivers". Operating systems do not communicate with monitors, they communicate with the graphics solution (integrated or card). It is up to the graphics solution to communicate with the monitor(s) properly, based on instructions from the OS. All the [so-called] monitor drivers do is provide a monitor name so Windows does not call it Generic PnP Monitor, and the "driver" reports the supported resolutions so Windows will gray out those not supported.

    Since you have a display on your second monitor, the monitor is working just fine. This is all about the video signal being sent to the monitor. So this is a setting problem between Windows and the graphics solution.

    In Control Panel > Display > Change display settings, does it show 2 monitors? And under Multiple displays, is it set to Extend these displays?

    I might suggest you check out a multi-monitor utility. My favorite is UltraMon not free, but worth it. Others have suggested the free DisplayFusion, but I have no experience with it.

    See also, Dual monitor setup is easy in Windows 7!
      My System SpecsSystem Spec

  4. #4


    Sydney, Nova Scotia, Canada
    Posts : 6,490
    Windows 10 Education 64 Bit


    The monitor inf file does more than just give the monitor a name, it also sets the supported resolutions for that monitor. Not the Video driver. And there is communication done with the Monitor. That's how Windows ID's the monitor and sets the correct resolution. Display Data Channel - Wikipedia, the free encyclopedia The only time you need to look for monitor Driver/inf file is if your monitor is not ID'd properly by a program etc. I had to hunt one up for my LG E2242. I have a game that will not set the correct resolution without it. Windows just showed it as generic. Other than that, installing the correct video driver for your video card and setting the monitor to the native resolution is enough.
      My System SpecsSystem Spec

  5. #5


    it also sets the supported resolutions for that monitor.
    As I noted above! It reports them so Windows grays out the unsupported. Note you can display the unsupported to by clicking on that option.

    And as noted above, the [so-called] driver reports the monitor name so it does not say Generic PnP Monitor.

    And please read your own Wikipedia article concerning the DDC. It clearly says (my bold underline added),
    DDC, is a collection of protocols for digital communication between a computer display and a graphics adapter
    Operating systems do NOT communicate directly with monitors. They tell the graphics card what they want displayed and the graphics card instructs the attached monitors on how to display it.

    And regardless, whether specific "drivers" are installed or not has nothing to do with dual-monitor setups and extended desktops.
      My System SpecsSystem Spec

  6. #6


    USA
    Posts : 689
    Windows 8.1 Pro with Media Center


    Quote Originally Posted by Itaregid View Post
    Looking for new drivers from Samsung's website and LG's website.
    Don't worry about monitor drivers - there really is no such thing as "monitor drivers".
    Actually the monitor driver does help Windows identify a monitor. Without the monitor driver, Windows will display the monitor as "Generic PnP.... even with the most recent video card drivers installed.

    Yes, Windows provides a set of generic PnP monitor drivers that can be useful, but for proper operation, especially if the monitor has other features, the monitor drivers from the manufacturer should be used.

    Here's device manager identifying my monitor with the monitor drivers installed...
    Click image for larger version

    Without them, it the monitor would be shown as Generic PnP.
      My System SpecsSystem Spec

  7. #7


    Actually the monitor driver does help Windows identify a monitor. Without the monitor driver, Windows will display the monitor as "Generic PnP.... even with the most recent video card drivers installed.
    As I noted twice before now! All you guys are doing is repeating what I already said. Identifying a monitor is NOT a device driver function. It is basically just a courtesy.

    A driver "adds" function support in Windows to a generic device. For example, without a driver a gaming mouse or keyboard will work like a generic mouse and keyboard using the generic drivers in Windows. When you add a device specific driver, you enable new functions of the device, like extra buttons that do non-generic things.

    especially if the monitor has other features
    Other features? What other features might a monitor have? Audio? That is set through the graphics card drivers. USB hub? That is done through USB drivers. Resolutions? That is already in Windows and via the graphics card.

    All a [so called] monitor driver does is gray out unsupported resolutions (and refresh rates, if applicable) to make it easier for the user to select supported resolutions. A monitor driver does NOT add resolutions or refresh rates - those are already supported by the OS naturally, and by the graphics card through the graphics card drivers.

    A monitor will NOT perform better, faster, brighter with it's [so-called] driver installed.

    This thread is about displaying an extended desktop across multiple monitors. That has absolutely nothing to do any monitor driver.

    To help the OP setup an extended display across both monitors, we need to determine what is wrong with his graphics solution, or OS.
      My System SpecsSystem Spec

  8. #8


    USA
    Posts : 689
    Windows 8.1 Pro with Media Center


    Have a good day.
      My System SpecsSystem Spec

  9. #9


    Sydney, Nova Scotia, Canada
    Posts : 6,490
    Windows 10 Education 64 Bit


    Quote Originally Posted by Itaregid View Post
    it also sets the supported resolutions for that monitor.
    As I noted above! It reports them so Windows grays out the unsupported. Note you can display the unsupported to by clicking on that option.

    And as noted above, the [so-called] driver reports the monitor name so it does not say Generic PnP Monitor.

    And please read your own Wikipedia article concerning the DDC. It clearly says (my bold underline added),
    DDC, is a collection of protocols for digital communication between a computer display and a graphics adapter
    Operating systems do NOT communicate directly with monitors. They tell the graphics card what they want displayed and the graphics card instructs the attached monitors on how to display it.

    And regardless, whether specific "drivers" are installed or not has nothing to do with dual-monitor setups and extended desktops.
    The info that is read via that communication is conveyed to the operating system. It goes through the Video card because that is in between Windows and the Monitor. I said there was communication done with the monitor, I never said what device did it. How do you think Windows knows if your connected to a wide screen TV of a monitor. The monitor ID is read and passed on to Windows. I guess I ruffled your feathers, that was not my intension.
      My System SpecsSystem Spec

  10. #10


    I guess I ruffled your feathers, that was not my intension.
    No you did not ruffle my feathers. I hope I have not ruffled yours. And no, you did not say what device did the communications, but you inferred (or at least I took it as an inference) that it was via the OS. And I'm really sorry but that is not correct. It is all via the graphics solution. All the monitor's inf file does is gray out what is not available to make it easier on the user. The inf does NOT enable any features as a real driver does.

    How do you think Windows knows if your connected to a wide screen TV...
    Yes!!!! How does it know??? Think about that for a second.

    I have connected many computers to widescreen televisions but NEVER installed any television "drivers". In fact, just looking at the webpage for my Samsung TV there are no drivers? No downloads at all? No DVDs came with my TV either. Yet my computer syncs up just fine with it. How do you explain that with no drivers?

    How do you explain this Sony TV not having any drivers? None for W7, W8, W10? And yet it still works as a computer monitor just fine.

    I have a shop and we build custom computers. We NEVER install the monitor "drivers" because most of the time, we don't sell a monitor with the computers. And yet Windows is able to set resolutions and refresh rates just fine. How - if no drivers are installed?

    Simple! Because that is a graphics solution function and we do install graphics drivers.

    The monitor ID is just an ID. It does not establish functions or features. And actually this information is provided via the EDID function of the monitor which is part of the monitor's firmware.

    And for the record, the DCC is NOT driver specific either.
      My System SpecsSystem Spec

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