Re: p5b deluxe -usb always on??
- From: Paul <nospam@xxxxxxxxxx>
- Date: Fri, 18 May 2007 10:46:28 -0400
Stan wrote:
Hello,
I have a asus p5b deluxe motherboard in my computer.
The computer is connected to a kvm switch which helps me switch between my old pc(abit be6r2) and the new one(Asus p5b).
Since I built the latest system I noticed a pecularity with the asus mb.
As stated both computers are connected to the keyboard ,mouse and monitor via the KVM switch.
When I switch off both computers my microsoft intellimouse's red laser stays on even though the systems of both comp. are switched off.
As you can imagine having the red laser on allnight is quite annoying. (especially since the pc is in my bedroom)
The kvm is a usb connected one, (connecting to the usb slots of the pc's) and reverts to ps2 for plugging in the keybord and mouse.
I use a ps2 the usb converter the connect the mouse to the kvm.
Now I have tracked the issue to the asus board.
If I unplug the the usb cable from the abit mb pc the light does not go out.
However if I pull out the usb (KVM) cable from the asus the light will go out.
This leads me to deduce that the asus board is providing power to the usb slots even though the pc is powered down.
Is there a way to stop that from occuring?
I have gone through the manual and the only solution I found was to disable usb support (not particularly useful as the kvm needs it to operate)
I friend has suggested there might be a jumper on the board that stops the problem?
It seems the usb ports are powered for some kind of 'wake on usb' feature.
Can anyone shed some light on the issue.
Thanks
Stan
On older motherboards, there were USB power headers, and they allowed the user
to select +5V or +5VSB for a pair of USB ports. But modern motherboards
are missing that feature. +5VSB is needed for "wake on USB", while +5V
is used if you want the USB ports to be unpowered when the computer
is in standby or soft off.
Paul
.
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