After recent bios update my monitor connected via usb hub stopped working

[Hryhorii21]

Hello everyone!

After a recent BIOS update, my monitor stopped working. Until everything was fine. Monitor is connected via USB-C hub, and I double-check on my other devices, it works. I tried to uninstall drivers from device manager, but it did not help at all. What could cause this issue and how I can fix it? (Model: HP ZBook Power 15.6 inch G8)

PS 1: I also updated all my drivers using HP Support Assistant trying to fix it 

[BeemerBiker]

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@Hryhorii21 wrote:

Hello everyone!

After a recent BIOS update, my monitor stopped working. Until everything was fine. Monitor is connected via USB-C hub, a

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I looked the graphics spec for your system and it mentions "Thunderbolt Doc G2"  as an option.

Is that the USB-C hub listed above?

The most recent bios is 1.16 dated May 11, 2024 and I read the following upgrade notification

"Intel Thunderbolt Firmware, version 15.0.0.0311"

The firmware on the thunderbolt port changed.

According to the service manual port 4 is the one to use for a video display (Thunderbolt).  

Port 4 on the other side is HDMI

Connect your USB-C monitor directly into the thunderbolt port and see if it works. If it does not then contact HP and complain about the firmware change

Click here to check warranty
and
Click here for world-wide contact info
Or contact the closest authorized service center

Reference

[Hryhorii21]

Thank you for your answer. My hub connected via thunderbolt port. Two of my monitors connected via HDMI. 1st use standard HDMI port. 2nd via hub with additional HDMI port

[BeemerBiker]

I do not know if it is possible to downgrade the thunderbolt firmware.

Is there a thunderbolt app on your system?   I am just guessing:  ---

1. Click Start.
2. Type Thunderbolt and click on the search result.
3. In the system tray, right-click the Thunderbolt icon.
4. Click Settings > Details.

If no actual app look in the device manager for the thunderbolt port and try updating its driver.   It is probably an Intel chip and possibly the Windows update can find a newer driver.

Else you may need to downgrade your bios which can be dangerous and on occasion is not possible.  I would contact HP and complain about the BIOS updates preventing your hub from not working.