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hp elitebook x360 g2 1030 looses ability to connect to external display after KB4577671

Olaf Eichstädt 101 Reputation points
2020-11-06T08:45:54.057+00:00

my hp elitebook x360 g2 1030 looses ability to connect to external displays via USB-C and HDMI after KB4577671

how can I get the external display (via USB-C, HDMI) back?

Windows 10
Windows 10
A Microsoft operating system that runs on personal computers and tablets.
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  1. Olaf Eichstädt 101 Reputation points
    2020-11-06T14:28:33.6+00:00

    This is the strangest thing ... and quite annoying. Here is what I did to get the external screens back to work, but it feels like voodoo:

    (1) uninstall the updates by reverting to previous recovery point
    => screen still does not work
    (2) unplug everything, wait 10s, dance around the desk, pray to the heavens and the earth
    (3) restart labtop and screen
    => screen is back with both USB-C and HDMI
    (4) scan for Windows updates again, let them install (including 4577671) with external screen plugged in
    => screen stays

    Would (2) have worked without going back to the restore point? I will never know.
    Would (4) have worked without the external monitor plugged in? I will never know.

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  1. Dale Kudusi 3,226 Reputation points
    2020-11-06T09:24:33.6+00:00

    Hi,
    This issue is not listed in the known issue of this update KB4577671:
    https://support.microsoft.com/en-us/help/4577671/windows-10-update-kb4577671

    you could try these troubleshooting steps before modifying system settings:

    • Confirm the monitor is correctly connected to a power source, and it's turned on.
    • Restart the computer to re-establish the connection.
    • Use the built-in controls on the monitor and make sure the correct input is selected.
    • Check the signal cable connection between the monitor and device's graphics card.
    • Disconnect the signal cable from both ends, wait about a minute, and reconnect it.
    • Use a different signal cable to confirm the problem is a broken connector or bad cable.
    • DisplayPort and HDMI come in different versions, so make sure to use the correct cable. (Check manufacturer for details).
    • Switch ports if the monitor and graphics card include multiple ports.
    • Connect the monitor to another computer to determine if it's not a problem with the monitor.
    • Connect another known working monitor to determine if the issue isn't the graphics card.
    • Disconnect all peripherals (such as printers, cameras, USB devices, etc.) to confirm that none of the other devices are conflicting with the display.

    Please try updating the display and GPU driver from the PC provider’s official site:
    https://support.hp.com/us-en/drivers

    Please feel free to let us know if you need further assistance.

    Best regards.

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  2. Olaf Eichstädt 101 Reputation points
    2020-11-06T10:19:26.947+00:00

    Confirm the monitor is correctly connected to a power source, and it's turned on.
    => workerd yesterday (before update), tried both HDMI and USB-C, tried 2 different monitors, monitor sees connection but says "no signal"

    Restart the computer to re-establish the connection.
    => same after restart

    Use the built-in controls on the monitor and make sure the correct input is selected.
    => monitor autoamtically select USB-C or HDMI depending on which connexction I try

    Check the signal cable connection between the monitor and device's graphics card.
    => workerd yesterday (before update), tried both HDMI and USB-C, tried 2 different monitors, monitor sees connection but says "no signal"

    Disconnect the signal cable from both ends, wait about a minute, and reconnect it.
    => used to work with USB-C, after failure I tried HDMI, but HDMI does no work either
    => powered monitor on and off, no change

    Use a different signal cable to confirm the problem is a broken connector or bad cable.
    => problem is there with USB-C and HDMI cable

    DisplayPort and HDMI come in different versions, so make sure to use the correct cable. (Check manufacturer for details).
    => oth cables worked in the past, USB-C yesterday, HDMI some weeks ago

    Switch ports if the monitor and graphics card include multiple ports.
    => problem is there with USB-C and HDMI cable

    Connect the monitor to another computer to determine if it's not a problem with the monitor.
    => both monitors I tried are fine

    Connect another known working monitor to determine if the issue isn't the graphics card.
    => I cannot use any monitor after the update ... so it definitely has to do with how Windows works with the built-in (the machine is a labtop) graphic card

    Disconnect all peripherals (such as printers, cameras, USB devices, etc.) to confirm that none of the other devices are conflicting with the display.
    => there is only a USB mouse, disconnecting the mouse does not change anything

    the newest Intel graphics driver and control panel is installed:
    27.20.100.8189