SDR Receiver stops computer from shutting down

Discussion in 'Computers, Hardware, and Operating Systems' started by 2E0CIT, Aug 22, 2021.

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  1. 2E0CIT

    2E0CIT Ham Member QRZ Page

    Running a Dell XPS-8700 with Win 10 Pro.

    My computer would not shut down, -the monitors went dark but the illuminated keyboard stayed on. I figured it was probably downloading updates or whatever but as this continued to happen I started investigating and found that when I disconnected one of my SDR receivers* the pc shut down as normal.


    (I have plenty of other USB peripherals which don't have this effect)

    I have set the USB management to not power-off when the computer is sleeping as it records TV from USB TV Tuner dongles when I'm not using it, but connecting this particular SDR stops the computer from shutting down when I tell it to!

    Not a big-enough a problem to bother Chris, the SDR manufacturer, as this issue is probably of my making, but it would be interesting to find out why this happens.

    Any ideas?
    73 Y'all, Jeff

    *an excellent Cross Country Wireless SDR -4+ http://www.crosscountrywireless.net/sdr-4.htm

    PS: I also get this popup which might be related to the problem :


    upload_2021-8-22_15-6-24.png
     
    Last edited: Aug 22, 2021
  2. NQ4T

    NQ4T XML Subscriber QRZ Page

    There have been cases where some USB hubs will prevent the PC from being able to shut down. This was a Vista issue but it may still exist in 10. I would imagine that thing has some sort of tuner front end that produces a baseband I/Q that is just sampled by an ADC. So there's likely a hub in the thing.

    Check the USB power settings for all hubs.
     
    AA5BK and 2E0CIT like this.
  3. N0WUE

    N0WUE Ham Member QRZ Page

    not sure what the XPS models call it, I believe the optiplex models referred to it as wake on usb. It is similar to wake on lan, but not quite. Depending on the chatter a device provides, it may never let a device fully shut down.

    it may be genericised as usb wake support.

    Unless you purchased a device specifically for it, you're probably not going to be missing out on any particular functionality by shutting it off. Yeah I know old thread, but someone else may deal with.
     
    2E0CIT likes this.

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