HDMI port can't connect to external monitor after windows update June 2024

I recently encountered an issue with my Lenovo laptop featuring AMD internal graphics, where it failed to detect an external display connected via USB - C to HDMI cable.

Despite trying various solutions such as reinstalling drivers, rolling back to manufacturer drivers, using a new USB-C to HDMI cable, and performing a Windows 11 factory reset, the problem persisted since October 2024.

What ultimately resolved the issue was powering down my laptop by holding the physical power button for one minute. Upon powering it back up, Windows 11 immediately auto-detected my external display. Pressing the Windows key + P allowed me to switch between the desired external display modes as before the problem occurred.

Hi, I have exactly the same issue. The USB-C port works fine if I use a USB-C to HDMI adaptor, so I know the cables and monitor are fine. Despite updating all drivers etc, I cannot get the HDMI port to start working again. I presume that the issue is that the laptop is no longer sending a video/audio signal to the HDMI port for some reason....

Wow! Fixed it, very easy!
Problem same as all above, lid closed, and HDMI monitor into sleeping mode.

Tried a lot on the lid settings, nothing improved. The easy fix (for me): Switch one time to Duplicate, and than back to Extend. (The Win + P) setting. Wow, just reactivated some corrupt setting on extend.

Years all!

I think the last update from Microsoft must have been done by the teenager on Work Experience. It messed up my camera, so the computer wouldn't recognize me. I managed to fix that. But now, today, a very embarrassing situation has occurred, and none of the HDMI ports were connecting to an AV system, and I was due to present a big PowerPoint presentation to a meeting. Thankfully, another person at the meeting had brought his laptop, so I was able to transfer my presentation onto a memory stick and transfer it to the other computer, which was a dreadful nuisance. I thought I had uninstalled the last Microsoft update, but obviously something's gone wrong, and I need some plain English steps to fix it please.

HI Alan,

Thank you for your response.

I have tried updating the drivers to the latest versions (manually) - both AMD and NVIDIA. Also updated the latest Chipset Driver for Acer. But the results are the same - no signal on external monitor. It's as if the HDMI port is nonexistent.

Drivers are installed and working properly. I also tried your suggestion to resetting display settings, but the issue remain.