If your USB printer is connected to a USB port on a portable computer docking station, connect the device directly to the USB port on the portable computer. If you face the same issue again, continue with the steps given below.
Disable power management of the USB hub
Note If you perform the following procedure, you may also reduce the battery life on a portable computer.
To disable power management of the USB hub, follow these steps:
1. Click Start , click Run , type Devmgmt.msc , and then click OK . The Device Manager window opens.
2. Expand Universal Serial Bus controllers .
3. Right-click a USB Root Hub in the list, and then click Properties . The USB Root Hub Properties dialog box is displayed.
4. Click the Power Management tab.
5. Click to clear the Allow the computer to turn off this device to save power check box, and then click OK .
6. Repeat steps 3 through 6 for each USB Root Hub in the list.
7. On the Action menu, click Scan for hardware changes .
Windows 7 recognizes the new device.
8. Close the Device Manager window.
If this doesn’t work, follow the Advanced troubleshooting steps from the Microsoft Knowledge Base article below.
Steps are equally applicable for Windows 7 Operating System.
How to troubleshoot USB device problems that may occur after a portable computer that is running Windows Vista resumes from sleep or from hibernation
support.microsoft.com/.../953367
