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I bought an USB wifi dongle recently and I want to connect it to my Raspberry Pi. When I connect USB wifi to Raspberry Pi, it seemingly dies - the SSH connection dies and I can't ping it (I don't connect keyboard and screen to Raspberry Pi, I only ssh to it). I wondered if it is only the network connection that dies, so I tried to run a simple script which every two seconds dumps "dmesg" to a file. I see that when I connect the USB wifi the script stops working - so it is not only SSH connection that dies but Raspberry pi stops working at all. However, when I disconnect USB wifi dongle and restart Raspberry Pi, it works correctly again.

When I connect USB wifi dongle, lamps on Raspberry blink this way: https://www.youtube.com/watch?v=0OPEZU7IJBY

When I connect the USB wifi dongle to my desktop computer (with Debian on it), this is what I see in dmesg:

  [Sun Mar 24 13:26:52 2019] usb 1-5: new high-speed USB device number 7 using ehci-pci
  [Sun Mar 24 13:26:52 2019] usb 1-5: New USB device found, idVendor=148f, idProduct=7601
  [Sun Mar 24 13:26:52 2019] usb 1-5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
  [Sun Mar 24 13:26:52 2019] usb 1-5: Product: 802.11 n WLAN
  [Sun Mar 24 13:26:52 2019] usb 1-5: Manufacturer: MediaTek
  [Sun Mar 24 13:26:52 2019] usb 1-5: SerialNumber: 1.0
  [Sun Mar 24 13:26:52 2019] usb 1-5: reset high-speed USB device number 7 using ehci-pci
  [Sun Mar 24 13:26:52 2019] mt7601u 1-5:1.0: ASIC revision: 76010001 MAC revision: 76010500
  [Sun Mar 24 13:26:52 2019] mt7601u 1-5:1.0: firmware: failed to load mt7601u.bin (-2)
  [Sun Mar 24 13:26:52 2019] mt7601u 1-5:1.0: Direct firmware load for mt7601u.bin failed with error -2
  [Sun Mar 24 13:26:52 2019] mt7601u: probe of 1-5:1.0 failed with error -2

How can I further diagnose this problem?

  • What Raspberry Pi do you use? – Ingo Mar 24 at 17:06
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    Sounds like a power supply issue. Do you see a lightening bolt in the top right corner if you connect the pi to the monitor?? – rohtua Mar 24 at 17:10
  • Does ssh and/or script work again when you unplug the USB/wifi dongle? Do you find some related in /var/log/syslog? Please address me with @Ingo otherwise I won't see your reply. – Ingo Mar 24 at 18:39
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Three things you can do to diagnose this problem:

  1. Check if your USB device is supported on the Raspberry Pi
  2. Check if the USB device allows you to connect to your WLAN when connected to your desktop computer
  3. In your Raspberry Pi terminal, type rfkill unblock all to see if you can enable your device. Aside from checking dmesg as you already did, you can checkout for error messages in /var/log/messages

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