Failed USB ports.
There is a common problem associated with USB ports where devices are frequently plugged and unplugged, or unplugged without being properly stopped. For some reason the Selective Suspend
feature in the registry will turn off the power to the USB hub which results in making the USB hub/s inoperable.
One way to try to restore this is to open the Device Manager
and right click on the device tree and select Scan for New Hardware
to force a bus reset.
If this fails to work, there is another way to work around this and keep this from happening again in the future, and that is to disable the Selective Suspend
feature. The Selective Suspend
is not a critical feature and usually will not effect normal operations after it is disabled.
This procedure involves making a change in the registry, if mistakes are made following the instructions the registry can be damaged which can result in the computer becoming inoperable. For this reason, you should beck up your registry before making any changes.Backup Your Registry with ERUNT
- Please use the following link and scroll down to ERUNT and download it.
- For version with the Installer:
Use the setup program to install ERUNT on your computer
- For the zipped version:
Unzip all the files into a folder of your choice.
Click Erunt.exe to backup your registry to the folder of your choice.
Note: to restore your registry, go to the folder and start ERDNT.exeTo disable Selective Suspend on all USB devices, do the following:
Open the Registry on the affected machine and navigate to the key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\USB
Edit or create a DWORD
value named DisableSelectiveSuspend
and set it to a decimal value of 1.
Reboot the computer.