Microsoft KB Archive/222584

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BUG: Blue Screen Occurs When Disabling a USB Controller

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Q222584

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The information in this article applies to:


 * Microsoft Windows 95
 * Microsoft Windows 95 Driver Development Kit (DDK)

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SYMPTOMS
When running on Windows 95 OSR 2.1 or OSR 2.5, a blue screen appears when manually or programmatically disabling a USB host controller.

CAUSE
This problem occurs because of a fault in the USB host controller driver.

RESOLUTION
There is no workaround for Windows 95 OSR 2.1 or 2.5. The problem does not occur under Windows 98. A USB controller can be successfully disabled using Device Manager, or programmatically via DiChangeState.

STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

MORE INFORMATION
If a user tries to disable a USB host controller via Device Manager or via a DiChangeState call, a blue screen occurs because of a fault in the USB host controller driver (Uhcd.sys or Openhci.sys).

Additional query words:

Keywords : kbDDK kbKMode kbOSWin95OSR210 kbOSWin95OSR250 kbVideo kbOSWin95

Issue type : kbbug

Technology : kbAudDeveloper kbWin95search kbWin95DDKSearch kbWinDDKSearch kbWin95 kbWin95DDK