RAPID PUBLISHING ARTICLES PROVIDE INFORMATION DIRECTLY FROM WITHIN THE MICROSOFT SUPPORT ORGANIZATION. THE INFORMATION CONTAINED HEREIN IS CREATED IN RESPONSE TO EMERGING OR UNIQUE TOPICS, OR IS INTENDED SUPPLEMENT OTHER KNOWLEDGE BASE INFORMATION.
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Consider the following scenario.� You downgrade the firmware of a device that supports MSI-X interrupts to firmware that only supports Legacy Line-based hardware interrupts.
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Windows�cannot�fall back to Legacy Line-based�interrupts.� Because of this, the device whose firmware has been downgraded to Legacy Line-based interrupts will no longer function.� As a result, you will no longer be able to access devices attached to the affected device.� For example, you will no longer be able to access disks attached to a RAID controller whose firmware has been downgraded to only support Legacy Line-based interrupts.
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The Storport driver does not have a mechanism to allow it to fall back from MSI-X interrupts to Legacy Line-based hardware interrupts.
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This behavior is by design.� Once a device that supports MSI-X interrupts has been installed, it cannot be downgraded to only support Legacy Line-based interrupts.
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