Windows 10 Usbc stopped passing video

MikeC · Feb 25, 2020

My usb-c output wich was designed to be a video out was working fine but after several windows security updates it has suddenly stopped working.
What has been changed and how do I unchanged it?
I have:
Updated my video drivers
Nvidea rtx2070
Reinstalled the hdmi and chipset drivers
Verified that the monitor and cable are working from a second source.
Disabled usbc and re-enabled from device manager

Neemobeer · Feb 25, 2020

I'd start by looking for events regarding video or the usb-c / thunderbolt device

MikeC · Feb 25, 2020

Neemobeer said:
I'd start by looking for events regarding video or the usb-c / thunderbolt device

Thank you for the overly obvious suggestion.
As much as I like wasting time digging through event logs trying to determine what Microsoft decided to randomly change during an equally random update, I was hoping someone from Microsoft might be able to just tell me what they have done to thunderbolt support recently.

Neemobeer · Feb 25, 2020

We have no affiliation with Microsoft. It's doubtful Microsoft would be able to give you any type of answer without gathering logs or debug output.

MikeC · Feb 29, 2020

An update on my issue.

Apparently Asus uses direct memory access in thier usbc charging driver which causes windows to disable the usbc port as a security risk.
I am currently working on finding the software responsible for this.

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