Trouble after manual roll back to the ACPI Hal

Discussion in 'Windows Guest OS Discussion' started by epirali, Dec 2, 2008.

  1. epirali

    epirali

    Messages:
    27
    Ok being the adventurous (read stupid) user that I am I tried manually rolling back to the ACPI Hal, and now Parallels VM crashes right before user login screen with attached screen shot. I can boot into Safe Mode, and Fusion can boot with no problems. I have tried switching number of processors, etc, and nothing has helped.

    Any thoughts or advice?
     

    Attached Files:

  2. Elric

    Elric Parallels Developers

    Messages:
    1,718
    Not a problem -)

    Just either

    a) boot to the safe mode, open the regedit (Start->Run->regedit.exe) and delete the key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\intelppm

    or

    b)
    1. Attach Windows Installation CD to Virtual Machine.
    2. Change boot sequence for Virtual Machine to boot from CD
    3. Start Virtual Machine.
    4. Once you see a first prompt from Windows, type "R" to enter recovery console.
    5. In Recovery Console wait for a prompt to choose your installation, type '1' followed by Return and enter administrator password
    6. Run the following command:
    Code:
    disable intelppm
    You will see service current status SERVICE_DISABLED
    7. Exit Recovery Console typing 'exit'.
    8. Virtual Machine will be restarted, and Windows will boot properly.
     
  3. epirali

    epirali

    Messages:
    27
    Thanks for the quick reply, I happened to find this right after I posted and was coming back to report.
     
  4. Tony Rossini

    Tony Rossini

    Messages:
    4
    Very interesting information. The more I read the more I understand.


    Does the registry key deletion or console code revert the vm back to single processor?
     
  5. Elric

    Elric Parallels Developers

    Messages:
    1,718
    afaik no, but I can't really say with confidence (it's not my work-area), the only thing I know for sure, that there are certain situations when driver intelppm fails and causes BSOD.
     
    Last edited: Dec 2, 2008
  6. epirali

    epirali

    Messages:
    27
    BTW the whole experiment was stupid of me, because I didn't pause to think through the fact that I have a 4 processor PowerMac and really SHOULD be running the multi processor HAL! I wasn't even able to boot with BootCamp until I used the very useful tech note, managed to boot and then reverted my the multi processor HAL using "RollBack Driver."
     

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