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Stan
Guest
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 Posted: Fri May 18, 2007 3:47 pm Post subject: p5b deluxe -usb always on?? |
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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 |
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Rob
Guest
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| Posted: Fri May 18, 2007 3:47 pm Post subject: Re: p5b deluxe -usb always on?? |
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"Stan" <stankos@(remove)netspace.net.au> wrote in message
news:f2kdas$dqq$1@otis.netspace.net.au...
| Quote: | 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.
|
I don't have that board, but my other Asus boards have jumpers
which allow you to use either +5VSB or +5V to power each pair
of USB ports.
In your case, it sounds like these jumpers (if they exist) are set
to +5VSB (ie the StandBy +5V that the PSU supplies to the
mobo as long as it's connected to the mains.)
Changing them to +5V will mean power is sent to the USB ports
only when the system is booted-up.
The only use I've ever seen for powering USB ports from +5VSB
is so that systems can be powered-up by a USB keyboard.
HTH,
--
Rob |
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Paul
Guest
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| Posted: Fri May 18, 2007 3:47 pm Post subject: Re: p5b deluxe -usb always on?? |
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Stan wrote:
| Quote: | 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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Brown Bear
Guest
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| Posted: Sat May 19, 2007 3:40 am Post subject: Re: p5b deluxe -usb always on?? |
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Have you tried all the USB ports including those mid board USB
headers? Maybe not all of them are powered.
On Sat, 19 May 2007 00:30:58 +1000, "Stan"
<stankos@(remove)netspace.net.au> wrote:
| Quote: | 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
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Howard Goldstein
Guest
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| Posted: Sat May 19, 2007 2:52 pm Post subject: Re: +5 vs +5 standby (was Re: p5b deluxe -usb always on?? |
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On Fri, 18 May 2007 15:20:00 -0400, Paul <nospam@needed.com> wrote:
: Howard Goldstein wrote:
: > On Fri, 18 May 2007 13:41:57 -0400, Paul <nospam@needed.com> wrote:
: > : What is an active extension cable ? A hub ?
: >
: > I suppose it's like an unpowered hub with one socket, or a repeater.
: > The one I'm using runs out to about 15'. It's supposed to regenerate
: > the signals to allow for undegraded extension.
: >
: > Here's the URL
: > http://www.amazon.com/Cable-USB-2-0-Active-Extension/dp/B0007QQJXO
: >
: >
: > What I'm thinking is if the conditioning on the power supply line is
: > different maybe could be accounting for the intermittent loss of USB
: > connectivity that I'm seeing. Or it could be a timing issue. I'm not
: > really sure what's going on....
:
: Get a copy of UVCView. Plug in the Bluetooth device directly to the
: computer first. UVCView will show the data structures for the device,
: found by enumeration. One of the pieces of information, is a declaration
: of the amount of current the device draws. The resolution is 2mA, and
: there are some rules about how much current can be drawn. My mouse,
: for instance, reports 98mA (which is a clever way of saying the
: consumption is <100 mA, which is a low powered device - the consumption
: is not likely to be exactly 98 mA). The information is a declaration
: of expected current consumption, and not an actual measurement.
:
: http://www.microsoft.com/whdc/device/stream/vidcap/UVCViewdwn.mspx
Cool! I'll try it. The cable vendor stated it would make contact
with the dongle maker to see if they could figure out what was up.
:
: Your extender device is *probably* only allowed to support a 100mA or
: less device. I doubt a 500mA device is allowed to go on the end of the
: extender. I could be wrong. (For 500mA to go on the end of the
: extender, I think the end would need its own power supply.) I
: don't know how much power a Bluetooth transceiver might draw.
: It shouldn't be very much.
I don't think it is, it gets just a little warm, like a cup of coffee
that's sat out for 20 minutes, not I don't think a half watt's worth
but my hands they don't measure dissipation like they used to...
:
: Another possibility, is there is some kind of power management
: feature, and the extender is "going to sleep".
Vendor suggested making sure this was off in the root hub devices,
which I did. Whether it's even the right knob or user adjustable I'm
not sure.
Thank you so very much for the pointer to UVCView |
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Robert Hancock
Guest
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| Posted: Tue May 29, 2007 10:43 am Post subject: Re: +5 vs +5 standby (was Re: p5b deluxe -usb always on?? |
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Paul wrote:
| Quote: | Howard Goldstein wrote:
On Sat, 19 May 2007 13:56:17 GMT, Howard Goldstein <hgoldste@mpcs.com
wrote:
: On Fri, 18 May 2007 15:20:00 -0400, Paul <nospam@needed.com> wrote:
: : http://www.microsoft.com/whdc/device/stream/vidcap/UVCViewdwn.mspx
: : Cool! I'll try it. The cable vendor stated it would make contact
: with the dongle maker to see if they could figure out what was up.
And just as an update UVCetc. reports the silly dongle claims it's
self powered which it clearly isn't unless it's one of Tesla's
inventions that manages to suck power out of the ether.
It could be that UVCview will not "walk" an arbitrary USB tree.
Maybe it only goes to the first level. Which means, when you
plug a hub in, the hub is being enumerated and claims it is
self-powered. (Meaning the hub is bus powered.) The device plugged
into the hub, probably cannot be listed at all by UVCview. (I couldn't
test this, because I have a distinct lack of USB devices. All I've got
to test with here, is a USB mouse. All my keyboards are PS/2, as are the
remained of my mice. And I have no hubs or the like.)
|
More likely, the USB's device descriptor is simply incorrect. There are
a LOT of USB devices (especially cheap ones) where the manufacturer
doesn't list things like the power consumption, self/bus powered status
(for hubs), etc. properly. In particular, a lot of hubs will report
themselves as "self powered" even when their AC adapter is not plugged
in and they are actually working in bus-powered mode.
--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/ |
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