Note
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One interesting quirk about the PNP_DEVICE_NOT_DISABLEABLE state is that once it has been set and the PnP manager has processed it, the state is sticky. By sticky I mean that even if you attempt to clear this bit on a subsequent IRP_MN_QUERY_PNP_DEVICE_STATE IRP, the PnP manager ignores your changes to this state. This state remains stuck until any of the following occur
- The machine is rebooted and the device is reenumerated
- The device (or any device in its ancestry) is surprise removed
- The device (or any device in its ancestry) is ejected
Comments
- Anonymous
August 11, 2008
The issue was something I was aware of before Doron mentioned the word in Once not disableable, forever