AFansHub

The Bluetooth connection must be disconnected when the iMac is plugged into a USB device. It is useless to ask for official technology

by Poster May 20, 2019 7
iMac (Retina 5K, 27-inch, 2017) System version 10.14. 5 (18F132) Fault description: As long as USB devices are plugged in, such as Android phones that use USB to transmit photos, USB flash drives, and mobile hard drives, as long as it is a USB3.1 blue interface device, Bluetooth will inevitably be unavailable. I called customer service, and the customer service honestly said that there are many people who encounter this problem. But I have also tried all the solutions he provided, such as: updating the system, resetting SMC, entering safe mode, trying Bluetooth connection and then restarting, and so on... Basically no solution. Later, a customer service told me that it might be caused by the interference problem of USB3.1, and suggested that I buy a USB Hub to reduce the possibility of interference through an external USB interface. So I bought one and found that it didn't work at all. Plugging a USB device into an external Hub would also cause Bluetooth to lose response. Performance after losing response: Bluetooth cannot restore the connection, and sometimes there will be a wavy line. If you plug in a USB mouse and click on the Bluetooth icon, it will be a big wind mill. My current solution is to restart the computer. I used the built-in Bluetooth keyboard and mouse set before. When it loses response, I can only press and hold the power button to restart. Now I have connected a USB mechanical keyboard, and with Alfred, I can still enter the Restart command normally to Restart. But it's a delay. As soon as I send the information, I have to restart the computer once. I've been using three generations of iMac, and I've never encountered this frequent Bluetooth failure. I wonder if any friends have encountered it? How is it solved?

Replies

  • Anonymous690 May 20, 2019
    Maybe you can use a USB to lightning cable to connect the keyboard and trackpad to your iMac and use it as a wired one. Although it will occupy two USB ports, and the wired is not good-looking, it should be able to solve the problem that the mouse and keyboard are disconnected when you plug in a USB flash drive.
  • Anonymous690 May 20, 2019
    Or something more ruthless, you buy a NUC, insert a USB flash drive into it, and copy the file. Then turn on hard disk sharing and let the iMac directly read the contents of NUC.
  • Anonymous10036 May 20, 2019
    What about typec? If no problem, buy an adapter or typec hub;
  • Anonymous5264 May 20, 2019
    Same question, however I am mbp2015. I'm using 10.14. 4 now, and it's like this after I bought it. I think it has something to do with the driver. Then, the Bluetooth system of previous versions was relatively stable, but now it doesn't work again until 10.14. 4. The solution to the problem is to reset, and smc restarted. In addition, a bug in vmware fusion will also cause Bluetooth to be disconnected.
  • Anonymous3123 May 20, 2019
    1. The cable of the usb3.1 hub should be long and as far away from the host as possible. The effect is good. I use this method now, and at least 2.4 gwifi can be turned on. 2. If the hub line is short, the online method is to wrap the wire and usb head with tin foil to isolate the signal Anyway, I just want to find a way to resist interference
  • Anonymous4757 May 21, 2019
    Updating the system, resetting SMC, entering safe mode, trying Bluetooth connection and then restarting are not as effective as the entire reinstallation. Make a U disk recovery disk, erase the entire disk and reinstall it. If this doesn't work, it will be a hardware problem. It is estimated that it is largely a system bug, but what you do cannot solve the system bug
  • Anonymous10281 May 29, 2019
    There is no perfect solution to this problem. This is a conflict between Bluetooth standard and USB3.0 standard, and has nothing to do with the system, drivers, etc. Use a USB2.0 cable (the cable should be more than 50cm) to connect the USB2.0 HUB to alleviate this problem (interference comes from the unique high-speed cable of USB3.0)