Troubleshooting SP 2 #21
Posted by NovaAngel at April 27th, 2007
USB devices that worked fine under SP1 are no longer recognised after upgrading to SP2.
SP2 does not update the USB drivers. Simply unplug and replug the USB cable so that Windows XP starts a search for new drivers automatically.
USB devices, usually mice and keyboards, suddenly stop working and only wake up after the USB cable has been unplugged and reconnected.
This happens because SP2 is incompatible with the USB port’s power-saving mode. In Device Manager, use the Power Management tab in the Properties sheet for each USB Root hub and uncheck the box labelled ‘Allow the computer to turn off this device to save power’.
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