Can't enter coherence after updating to parallels 18.

Discussion in 'Windows Guest OS Discussion' started by rennyo, Aug 13, 2022.

  1. rennyo

    rennyo Bit Poster

    Messages:
    2
    After updating to parallels 18, my windows 11 host failed to switch to coherence mode.

    "An error occurred while switching to Coherence. Please try again"

    Not sure if this is related to my prior error(also after updating to parallels 18), i added video.metal=0 in the boot order to fix this error.
     
  2. Asish@Parallels

    Asish@Parallels Staff Member

    Messages:
    163
    Hello @rennyo, We are glad that you have resolved the issue. Thank you for sharing your experience in order to resolve the issue. Please reach us back for further assistance. Have a nice day!
     
  3. rennyo

    rennyo Bit Poster

    Messages:
    2
    Hi, the issue is not fixed. The issue that I fixed was the previous issue prior to this issue.
     
  4. Asish@Parallels

    Asish@Parallels Staff Member

    Messages:
    163
  5. AndrewD21

    AndrewD21 Bit Poster

    Messages:
    4
    I am having the same issue and have tried re-installing Parallels Toolbox with no change. Still unable to enter Coherence mode since updating.
     
  6. OlafS11

    OlafS11 Bit Poster

    Messages:
    2
    The Same, aber 12.5.1
     
  7. Mikhail Ushakov

    Mikhail Ushakov Parallels Team

    Messages:
    152
    Hello!
    Kindly collect a fresh technical report at the moment of reproduction (click Parallels icon (||) > Help > Send technical data > check "Attach screenshots..." > press Send Report) and send the report's 9-digit ID in your reply. Please note that the virtual machine must be running when you collect a report.
     
  8. AndrewD21

    AndrewD21 Bit Poster

    Messages:
    4
    405024288

    Thank You
     
  9. Mikhail Ushakov

    Mikhail Ushakov Parallels Team

    Messages:
    152
    Thank you for the reply. Kindly perform the steps below:
    1. Right-click Windows menu > select Device Manager
    2. Expand the 'Display Adapters' section, right-click Parallels Display Adapter (WDDM) > press Uninstall device
    3. After uninstalling the Parallels WDDM adapter install Parallels Tools again, and they should complete.
     
  10. AndrewD21

    AndrewD21 Bit Poster

    Messages:
    4
    Issue Persists.

    When Parallels tools is re-installed. the "Parallels Display Adapter (WDDM)" is reinstalled within the Windows environment.

    I uploaded extra screenshots for steps taken.

    I created another Technical Data Export: 405317417
     
  11. AndrewD21

    AndrewD21 Bit Poster

    Messages:
    4
    Screenshots
     

    Attached Files:

  12. NikolaiS@Parallels

    NikolaiS@Parallels Staff Member

    Messages:
    26
    @AndrewD21, thank you!

    We're created a ticket to further investigate the situation, and will contact you there shortly.
     
  13. KennethF

    KennethF Bit Poster

    Messages:
    49
    I had the same problem--if I suspended and resumed it would work. But I just reinstalled Parallels Desktop and both problems went away.
     

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