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December 5, 2020

KB4571756 (Temporarily) Kills Internet Dongle on X380 Yoga Test PC


Here’s one I haven’t seen in a while in testing Release Preview builds. After updating my Lenovo X380 Yoga to KB4571756, I found it using Wi-Fi instead of GbE via the Intel I219-LM and its US$35 dongle. Curiously enough, I plugged in my older ASIX AX88179 USB 3.0 to GbE device and the PC immediately went wired once again. Checking in Device Manager, the I219-LM still showed as present, and even reported “This device is working properly.” Wrong!

Local driver pick list

Reasoning that the top item was most recent, I went for the one beneath it as my update target.
That worked! [Click image for full-sized view.]

Returning the I219-LM to Operation

Something had obviously gone sideways with the I219-LM driver. So I right-clicked the device inside Device Manager, and picked Update driver from the resulting pop-up menu. I then picked the “Browse my computer for drivers” and selected the second entry in the resulting pick list, as shown in the preceding screencap. It took a while for the X380 to get this alternate driver version installed. But once it finished I was able to plug the dongle back in, and regain its proper functioning.

It’s not unusual for networking to get a little discombobulated after an update or upgrade via WU. One of my other, older Lenovos — the X220 Tablet — routinely loses the Public Network settings for Advanced Sharing and reverts to defaults after a Dev Channel update. I often have to reset the All Networks items for Public folder sharing to “Turn on…” and for Password protected sharing to “Turn off…” to get RDP into that PC working when the update is done. These things happen, but can usually be worked through with a little carefully targeted trial-and-error experimentation.

And indeed, that *IS* the way things sometimes go here in Windows World. Also, note that my access to an extra USB 3 GbE dongle helped me identify that the I219 driver was the unmistakeable culprit. I keep extra Wi-Fi, Bluetooth and Logitech dongles around just to have a spare to try if a primary should stop working, or go missing from Device Manager, as they sometimes do. If you’re ready to shoot trouble as soon as it shows up, it won’t get the drop on you!

Author: Ed Tittel

Ed Tittel is a 30-plus-year computer industry veteran. He’s a Princeton and multiple University of Texas graduate who’s worked in IT since 1981 when he started his first programming job. Over the past three decades he’s also worked as a manager, technical evangelist, consultant, trainer, and an expert witness. See his professional bio for all the details.

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