Allow Laptops to Enter Power-Saving State (Increase the USB Polling Interval)

Some laptops' processors may not be able to enter their power-saving state, even when they're idle, because USB polling fools the processor into thinking that the laptop is active. Your system polls your USB ports once every millisecond to see whether a device is present. So, even if a device isn't present, it continues that polling. The problem is that some laptop processors won't go into their power-saving state because the constant polling makes it think that the laptop is active.
With a Registry hack, you can increase the polling interval from the default of one millisecond, letting the processor enter its power-saving state. Run the Registry Editor and go to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Class\{36FC9E60-C465-11CF-8056-444553540000}\0000. Create the new DWORD value IdleEnable and set the data value to a number between 2 and 5. This will set the polling interval, in milliseconds. If there are additional subkeys for HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Class\{36FC9E60-C465-11CF-8056-444553540000} (such as 0001, 0002, etc.), repeat the procedure and create the IdleEnable DWORD in each of them. Exit the Registry. You may need to reboot for the new setting to go into effect. You also may need to try several different values until you find one that works.