Hi, I would like to report a potential bug/issue with August 11, 2020—KB4566782 (OS Build 19041.450)
I'm using Windows 10 build 2004.
Installing this update kb4566782" caused "Automatic driver update" functionality in device manager mmc plug-in to break.
Describing the problem behavior after kb4566782 is installed:
Within device manager , either in computer management or standalone devmgmt.msc, select any device - right click - update driver - search automatically for drivers - the wizard DOES NOT go to "Searching online for drivers..." stage and comes back with the status "You are already using the best driver..." within 1 second.
I used procmon/process explorer to compare this behavior to 2 known working instances :
A July07, image from same machine, and another machine running build 1909; And in both these cases, mmc.exe hosting device manager is showing making calls through wininet.dll to discover proxy, IE zones and finally going out to the network.
While in broken instance, no calls to wininet.dll are made. Process explorer confirms that wininet.dll is NOT loaded on device manager launch on the broken instance, while it is in both working instances. I uninstalled/reinstalled the kb4566782 twice to confirm, and was able to reproduce the issue.
Additional finding: Attempting to repair through DISM or sfc commands does not work.
The only recoruse is to either uninstall the update, or to revert to an earlier image.
As well as in some cases, device manager might disappear altogether from computer management after kb4566782, though standalone devmgmt.msc still loads the mmc console. But the above issue with driver update is still exhibited.
Steps to repro:
Install kb4566782 on Windows 10 Build 2004
Launch device manager mmc
Locate the mmc.exe instance for devmgmt.msc, it should be a child process of runtimebroker.exe
User process explorer to check if wininet.dll is loaded inside this mmc.exe instance
Attempt to perform an automatic driver update for any device, and verify if it goes to "Searching online...." stage or not