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McZ_123
Contributor
Contributor

Win 8.1, USB-Problem, Enhanced Power Management

Good morning,

I am using VM Workstation 10.0.2 build-1744117 on a Win7/64 platform.

Using a virtual machine Win 8.1 Pro/64 and Win 8.1 Pro/32 as well I experienced a problem after

connecting a USB-HID device. The device is found and tunneled by VM Workstation,

but the PC application, which communicates to the USB-HID device could not connect

to it.

This happens if a certain delay occurs between attaching the USB device and trying to connect

to it. If the delay is very short (1-2s only) the connection can be established and is stable afterwards.

After several tests I'm convinced, that the Enhanced Power Management of Win 8.1 is responsible.

If I switch this feature off in the registry, the device can be found under every condition.

Cross-checking with a "real" Win 8.1 Installation (no virtual machine) I found out, that this malfunction

only occurs in the virtual machine.

Has anyone seen the same problems?

Best regards,

McZ

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