Windows 10: Dismount-VmHostAssignableDevice Error on Line 8

Discus and support Dismount-VmHostAssignableDevice Error on Line 8 in Windows 10 Customization to solve the problem; While trying to set up PCIe passthrough to a VM through PowerShell and I ran into an issue where the Dismount-VmHostAssignableDevice command keeps... Discussion in 'Windows 10 Customization' started by Damien Claessen, Sep 25, 2019.

  1. DAMIEN CLAESSEN
    Damien Claessen Win User

    Dismount-VmHostAssignableDevice Error on Line 8


    While trying to set up PCIe passthrough to a VM through PowerShell and I ran into an issue where the Dismount-VmHostAssignableDevice command keeps giving me an error about not having OS control of the PCIe bus. It originally said the error was on line 1 char 1, and I looked up the error and found that I needed to enable VTd and Platform Power Management. After enabling these, I tried to run the command again, and the error was the same, but the line number changed to line 8. I do not know much about PowerShell, and I have no idea what is the issue now, especially now that the required options in the BIOS are changed. Any ideas?


    Command:


    Dismount-VmHostAssignableDevice -LocationPath $locationPath -Force -Verbose


    Log:


    VERBOSE: Dismount-VmHostAssignableDevice will dismount an assignable device so it can be assigned to a virtual machine.

    Dismount-VmHostAssignableDevice : The operation failed.

    The current configuration does not allow for OS control of the PCI Express bus. Please check your BIOS or UEFI

    settings.

    At line:8 char:1

    + Dismount-VmHostAssignableDevice -LocationPath $locationPath -Force –V ...

    + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    + CategoryInfo : InvalidArgument: Dismount-VmHostAssignableDevice Error on Line 8 :)) [Dismount-VMHostAssignableDevice], VirtualizationException

    + FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.DismountVMHostAssignableDevice


    EDIT: I realized line 8 is because I ran other commands before this command, so line 8 has nothing to do with why it isn't working. Any ideas why I would be getting this error even though I enabled the features?

    :)
     
    Damien Claessen, Sep 25, 2019
    #1
  2. NAKI
    Naki Win User

    GPU-Z what command line parameter ?

    Suggestion: /? (-?) and /help (-help) command-line arguments to show a list of all possible arguments in a small window. *Smile Dismount-VmHostAssignableDevice Error on Line 8 :)
     
    Naki, Sep 25, 2019
    #2
  3. RYANLY
    ryanly Win User
    GPU-Z what command line parameter ?

    Current /? (-?) or / help (-help) parameter is invalid
     
    ryanly, Sep 25, 2019
    #3
  4. MONK.E83
    Monk.e83 Win User

    Dismount-VmHostAssignableDevice Error on Line 8

    Unlocked Realtek HD Audio Drivers Windows 7 & 8 (With Dolby Digital Live and DTS Interactive)

    DTS supported natively by Windows 8/8.1 and it should work on windows 10 too just DDL require to unlock your driver .
     
    Monk.e83, Sep 25, 2019
    #4
Thema:

Dismount-VmHostAssignableDevice Error on Line 8

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