The system wakes from sleep or hibernate.USB devices connected to USB 2.0 or 3.0 ports will cease to be recognized, or a Windows 9F blue screen (STOP) error occurs after the following actions: USB devices not recognized or STOP ERROR 0x9F. It can be found on the Microsoft support site.This article provides the information on "USB devices connected to USB 2.0 or 3.0 ports will cease to be recognized, or a 9F stop error". The Microsoft hotfix in KB2895729 resolves this issue. It is assumed this issue could occur on systems with similar operating systems chipsets. This issue has been documented to occur on the OptiPlex 3020, the Latitude 3340, and the Precision M3800 with the Windows 7 professional 圆4 operating system. When the error is present, attempts to shut down the system through Windows will result in a freeze on the "Shutting Down" screen, requiring a hard shut down by pressing and holding the power button until the system power off. Disconnecting/reconnecting the USB devices does not resolve the issue.
The issue may also occur intermittently during active system use.
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