Laptop USB ports stay live in Standby

I'd appreciate if anyone can advise on whether these effects are normal with
Vista SP1, and whether there's a work-around. I've searched pretty widely
and found these two other references to similar problems, but no solutions
as yet: http://forum.notebookreview.com/showthread.php?p=3206105,
http://www.dslreports.com/forum/r20136671-Vista-Turning-off-USB-port-power-during-sleep.

I'm using a new Toshiba R500 laptop running Vista and I find, unexpectedly,
that the USB ports keep providing power even when the laptop is in Standby.
(I expected they would power down like they do in XP).

I'm using a Logitech VX Nano cordless mouse where the tiny dongle is
supposed to be left plugged in all the time. However if I do leave it
plugged in, I find that the battery runs down too fast. I think this is
because the USB port continues to power the dongle even during standby. To
confirm that the USB port is powered up during Standby I plugged in a wired
optical USB mouse to a USB port during Standby. sure enough, its bright red
led comes on just as it does when the computer is powered up.

Another annoying thing is that if I put the machine to Standby while a USB
mouse or mouse dongle is plugged in, then the machine immediately wakes up
if I unplug the mouse or dongle. This is something you often need to do
with a laptop and is quite ok to do in XP.

A couple of other things that may be relevant: (1) The option 'allow the
computer to turn off this device to save power' is ticked for all five USB
Root Hubs in Device Manager. (2) In Device Manager/ Mouse Name/ Properties
/Power Management the tick box for 'Allow the computer to turn off this
device to save power' is greyed out for all the mice I've tried.

Thanks for any help.

--
David Tong

[Please replace 'invalid' with 'com' to reply].



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Relevant Pages

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