1.    30 Aug 2017 #1
    Join Date : Sep 2015
    Posts : 49
    Win 10 Pro 64 bit

    "USB device not recognised" notification keeps repeatedly flashing up


    I've tried going into device manager and disabling and uninstalling to no avail. How do I get rid of this as it's repeatedly coming up and is driving me nuts Device mgr when open refreshes on each notification and show the offending unknown device.

    Incidentally I have tried going into settings and disabling "Notify me if there are any issues connecting to USB devices". This get's rid of the notifications but does not really solve the problem just hides it.

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    Last edited by Gusgf; 30 Aug 2017 at 13:58.
      My ComputerSystem Spec
  2.    30 Aug 2017 #2
    Join Date : Nov 2015
    Posts : 133
    Windows XP, 7, 8.1, 10, Knoppix [Debian] linux

    What type of device is connected?
      My ComputerSystem Spec
  3.    30 Aug 2017 #3
    Join Date : Jul 2016
    Earth
    Posts : 213
    Windows 10 pro on both

    I have the same problem if i use to long an ext cord even with a powered usb hub driving me nuts. so try using a different usb cable if your having a problem with a hub.
      My ComputerSystem Spec
  4.    30 Aug 2017 #4
    Join Date : Aug 2017
    Posts : 2
    Windows 10

    I had this problem. Turned out to be a faulty micro USB connector. I bought a new one and it stopped happening.
      My ComputerSystem Spec
  5.    01 Sep 2017 #5
    Join Date : Apr 2015
    Posts : 229
    Windows 10 x64 v1703

    When you connect a USB device, the USB controller on m/b senses an electrical change on the bus so it knows there's a device change. Then there's a h/w handshake between the m/b controller and remote device. When handshake done, the device sends Windows its Device Descriptor (identifying itself)

    If the handshake fails or device can't send its descriptor, Windows knows something is out there but has no idea what it is (because it doesn't receive a Device Descriptor). Thus you get "Not Recognized" message. Disabling doesn't help as you can't really disable an Unknown device (Without a device descriptor, windows has no way to identify what to disable!)

    Some USB device is connecting the bus but the handshake is failing or device can't send its descriptor. What USB device is connected but not in Device Manager/not working? Have you tried disconnecting the hub? connecting devices directly to computer usb?
      My ComputerSystem Spec
  6.    01 Sep 2017 #6
    Join Date : Aug 2016
    S/E England
    Posts : 4,503
    10 Home x64 (1709) (10 Pro on 2nd pc)

    I had this for a dumb device - it just had a battery that needed charging, nothing in it that could possibly be recognized or used by the PC. It started intermittently after about six months of use, got more regular and eventually stopped charging. A new usb cable fixed the problem, but only for another six months. Turns out the micro usb socket on the device was poor quality and gradually destroyed any connector that was plugged into it. some of the connections shorting together was what fooled the PC into thinking there was an active device on the end of the cable.

    What's your device? If it's connected by a cable, try a new cable.
      My ComputersSystem Spec
  7.    01 Sep 2017 #7
    Join Date : Aug 2014
    Forever West
    Posts : 3,922
    Win10 Home and Pro, Win10 Insider Preview, Win7 Home, Linux Mint

    Generally speaking, USB has a single cable limit of 16 Feet unless using an Active cable [expensive] for longer runs. USB may be extendable using Self-powered hubs, i.e. Computer with cable to a Hub with another cable from Hub to a Device.
      My ComputerSystem Spec
  8.    02 Sep 2017 #8
    Join Date : Sep 2015
    Posts : 49
    Win 10 Pro 64 bit
    Thread Starter

    Quote Originally Posted by ComputerGeek View Post
    When you connect a USB device, the USB controller on m/b senses an electrical change on the bus so it knows there's a device change. Then there's a h/w handshake between the m/b controller and remote device. When handshake done, the device sends Windows its Device Descriptor (identifying itself)

    If the handshake fails or device can't send its descriptor, Windows knows something is out there but has no idea what it is (because it doesn't receive a Device Descriptor). Thus you get "Not Recognized" message. Disabling doesn't help as you can't really disable an Unknown device (Without a device descriptor, windows has no way to identify what to disable!)
    Some USB device is connecting the bus but the handshake is failing or device can't send its descriptor. What USB device is connected but not in Device Manager/not working? Have you tried disconnecting the hub? connecting devices directly to computer usb?
    All I've done is to disconnect all usb devices physically and then reconnect (without a reboot). But to no avail. I don't want to have to uninstall all my usb drivers as this seems like taking a hammer to open a can of beans!!

    Though I've disabled the notifications all this does is visually disable the notifications I can still hear the notification alert!!
      My ComputerSystem Spec
  9.    02 Sep 2017 #9
    Join Date : Sep 2015
    Posts : 49
    Win 10 Pro 64 bit
    Thread Starter

    Quote Originally Posted by Bree View Post
    I had this for a dumb device - it just had a battery that needed charging, nothing in it that could possibly be recognized or used by the PC. It started intermittently after about six months of use, got more regular and eventually stopped charging. A new usb cable fixed the problem, but only for another six months. Turns out the micro usb socket on the device was poor quality and gradually destroyed any connector that was plugged into it. some of the connections shorting together was what fooled the PC into thinking there was an active device on the end of the cable.

    What's your device? If it's connected by a cable, try a new cable.
    No idea. This has been happening since connecting something but I can't remember what it was now. But your theory of an electrical short on the USB connections is a good one so I will test this out.
      My ComputerSystem Spec
  10.    02 Sep 2017 #10
    Join Date : Sep 2015
    Posts : 49
    Win 10 Pro 64 bit
    Thread Starter

    Quote Originally Posted by WDG View Post
    I had this problem. Turned out to be a faulty micro USB connector. I bought a new one and it stopped happening.
    Yes this might very well be the issue indeed. I've got a very short USB cable attached which has something connected on the other end ad hoc that may very well be the culprit.
      My ComputerSystem Spec

 


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