No Display after BIOS Update (USB-C Alt Mode in Linux)

[BUBUsnet]

Hello,

after updating the UEFI BIOS of my HP EliteBook 845 G7 with Linux Mint 21 (checked with different kernels) to Version Ver. 01.10.00 I got a problem:

The external Display (attached via USB-C Alt mode) won't get awake after starting the Notebook. In dmesg I get:

[  134.736643] [drm] DP Alt mode state on HPD: 0
[  134.938085] [drm] Alt mode has timed out after 201 ms

Sometimes when I unplug and replug the USB Cable it works normally! Even in the LUKS decryption menu at startup.

I saw a similar problem in the following thread:

https://h30434.www3.hp.com/t5/Business-Notebooks/After-BIOS-update-can-t-display-through-usb-c-docki...

Can you help me to solve the problem?

Kind regards

Michael

[JohnnyHa]

We are experiencing the same on Windows with different models, not only G7. Power cycle seems to fix it until they plug out and in again.  Keep me updated if you ever find a solution for this. 

[BUBUsnet]

Aa a temporarily workaround I sometimes reset the USB embedded controller to make it work again:

1. Power the computer off.
2. Press and hold the power button down for 30 seconds

I also noticed that it worked most times, if I plug the USB cable in when the system is already started.

Nevertheless hoping for a bugfix of the USB controller.

[MKMP]

Also same problem - G9 445 Probook.

Top tip from a poster about only plugging back in once the unit has started backup.  If not the problem continues.

[MKMP]

This is now fixed in the latest bios (01.09.01 Rev A - release 21/12) for my machine (manual check via the support pages), so would suggest checking if yours also has an update.

[Avean]

Still issues with the 855 G7 series laptops. Latest bios is still 01.11.00 Rev.A from November. Issue appears in bios version 01.10.00 Rev.A where it updates the USB-C Controller from 1.05 to 1.06 which cant be rolled back 😞