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Thread: Opus / USB Hub - Standy Power

  1. #1
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    Opus / USB Hub - Standy Power

    My usb hub stays on when the Opus shuts off. I guess the usb ports get power from the standby rail.

    Plugged into the hub is my RF keyboard reciever and USB to Serial adapter. In the motherboard usb port is the CoPilot 2k3 reciever and hub.

    The hub and keyboard receiver leds are still on when the pc is powered off. Should I be worried, will I wake up to a dead battery in the morning?

  2. #2
    Maximum Bitrate gizmomkr's Avatar
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    I THINK the opus looks to the BIOS settings, if you have enabeled standby mode (even if not curently in standby AkA -you shut down) then I believe the PSU will continue to feed the rail. If your setup is configured for atx pushbutton = power off - The opus will cut off completely after no more than 30 seconds. (thats the mode I run in)
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  3. #3
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    Hi!
    I guess you use Via Epia Motherboard?
    Opus is not the thing there but the MB. The Epia feeds USB connectors from 5VSB line which has to be powered all the time defined by ATX- specs. Stupid isntīit? Ive tried everything in BIOS, but I havenīt found any setting for this. I think it has to do something with wake-on-USB- functionality. Iīve tried this wit another type of MB and it works just great.

    Hope this helped,


    /pete

  4. #4
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    Nope, I don't use a Via. I use an MSI 845GEM.

    Theres alot of settings under power management section in the bios, including wake on usb. I have yet to play with them all, but none seem promising.

    The USB hub and only the RF keyboard stay lit after the opus turns off. My guess is power usage is nominal. I've left it plugged in for the last few days. Car starts up fine in the morning.

    I believe opus specs says 5V @ 1A (2A peak) in standby. I'm not sure what that means in car battery terms, but I hope its an insignificant amount.

  5. #5
    Maximum Bitrate gizmomkr's Avatar
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    Standard Car bat - I would say probably around 80 amps
    no not the CCU, but an actual sustained rating - close to 80. I have cranked a four cylinder off a fully charged 20 amp bat. So I would say your probably safe.
    Gizmo-
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  6. #6
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    Is it a powered USB hub? To fix this problem, connect the power of the USB hub to a 5v connecter off of the opus. This way, when you turn the pc off, the usb hub turns off.

  7. #7
    Maximum Bitrate gork's Avatar
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    OK. Here's the solution to this problem of powered usb hubs and EPIA boards.

    Even if it's a powered hub, it can probably work unpowered as well. Many old USB hubs *required* external power to work, but new ones all seem to have a fallback port-powered mode. This was the problem I ran into the other day. I couldn't find a single hub at the store that would NOT work without the external adaptor. They ALL work when powered only by a USB port .. of course, they can't give out a very large amount of power on their ports, but they work. I hooked the hub up to the USB port and the 5V to the opus drive power connector and when the computer shut down the hub and all peripherals were still powered (from usb).

    Here's how you can modify any usb hub to NOT work without power applied via the external jack:

    1) Open the hub up and get your voltmeter. Find the 5V line coming in from the USB port on your computer. Be careful doing this.

    2) Unplug the hub and cut the wire or PCB trace supplying the hub with 5V from the computer.

    3) Find a solder point for the 5V line coming into the hub from the external power jack and solder a jumper wire in between there and the location you just took 5V away from.

    Here's a diagram. (Pheer my mad MSPaint stylings!)
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