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Hardware Forum / Motherboards / ASUS / May 2007p5b deluxe -usb always on??
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 > Hello, > I have a asus p5b deluxe motherboard in my computer. [quoted text clipped - 28 lines] > > 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,  SignatureRob Regarding +5VSB mentioned by Rob and Paul, are there are any differences with respect to the current rating or conditioning during power on between +5V and +5VSB? (I'm having a weirdo problem with a P5W DH deluxe and an active extension cable to remote a bluetooth dongle and it's proving amazingly resistent to cure, and attempting to switch USB power sources to a different pole is the only thing I haven't tried) Yes, there are huge differences. +5 volts is the main 5 volt supply; the rating is in the tens of amps. +5 volt standby is a low current supply that only goes to specific places, and is usually only about two amps. > Regarding +5VSB mentioned by Rob and Paul, are there are any > differences with respect to the current rating or conditioning during [quoted text clipped - 3 lines] > switch USB power sources to a different pole is the only thing I > haven't tried) > Regarding +5VSB mentioned by Rob and Paul, are there are any > differences with respect to the current rating or conditioning during [quoted text clipped - 3 lines] > switch USB power sources to a different pole is the only thing I > haven't tried) The current rating of the supplies is different. +5VSB is 2 to 3 amps. +5V is 20 to 30 amps. Those are typical numbers seen on the label on the side of the supply. +5VSB comes on immediately, when you switch on at the back. +5V comes on when you switch via the front. What is an active extension cable ? A hub ? Paul : 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.... > : What is an active extension cable ? A hub ? > [quoted text clipped - 9 lines] > 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 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. Another possibility, is there is some kind of power management feature, and the extender is "going to sleep". Just some guesses, Paul : Howard Goldstein 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 : 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. > : On Fri, 18 May 2007 15:20:00 -0400, Paul <nospam@needed.com> wrote: > : : http://www.microsoft.com/whdc/device/stream/vidcap/UVCViewdwn.mspx [quoted text clipped - 5 lines] > 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.) I guess my hunt for a decent USB utility continues... I was hoping this would be the one, but obviously it isn't. I've used some other pretty pitiful utilities like it, but some of those couldn't even figure out how many USB ports the computer had. At least this one found all the ports on my machine. Paul >> : On Fri, 18 May 2007 15:20:00 -0400, Paul <nospam@needed.com> wrote: >> : : http://www.microsoft.com/whdc/device/stream/vidcap/UVCViewdwn.mspx [quoted text clipped - 13 lines] > 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. SignatureRobert Hancock Saskatoon, SK, Canada To email, remove "nospam" from hancockr@nospamshaw.ca Home Page: http://www.roberthancock.com/ > Hello, > I have a asus p5b deluxe motherboard in my computer. [quoted text clipped - 28 lines] > 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 Have you tried all the USB ports including those mid board USB headers? Maybe not all of them are powered. >Hello, >I have a asus p5b deluxe motherboard in my computer. [quoted text clipped - 28 lines] >Thanks >Stan |
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