Desktop Video, Display and Touch

Hello all,

this week I stumbled upon a rather strange behavior of the HP U28 monitors.

A brief description of my setup:

- 1x Macbook Pro, i9, 16GB RAM, 512GB SSD, Macos 10.15.7.
- HP Thunderbolt Dock G2, 120W
- 2x HP U28

Macbook -- thunderbolt --> HP Dock G2 -- displayport --> 1. HP U28
                                                                             -- usb-c --> 2nd HP U28

The 2nd HP U28 is connected via usb-c cable because the Macos does not support MST, and therefore the 2nd displayport in the HP Dock cannot be used.

Both monitors have been working great for the last few weeks after solving the MST problem.

This morning I encountered a strange phenomenon:

- I come into the office and connect my Macbook to the HP Thunderbolt G2 and nothing happens.
- ok, I think to myself, the dock has hung up, I connect one of the monitors to my Mac, but nothing happens
- ok, then I try it with another adapter, nothing happens
- I turn the monitor on and off, nothing happens
- ok - I swap the Macbook for another one, connect the monitor, nothing happens

**bleep**, that can't be - then a thought comes to my mind - does the monitors firmware have a problem maybe ? How about disconnecting the monitor from the power supply - and lo and behold, after I disconnected both monitors once, they work normally again.

But what is the cause ?

Do the monitors need a firmware update ?

How can I report the problem to HP so that someone can take a look at it ?

Has anyone of you ever had a similar problem ?

I would be glad about feedback !

Oliver