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HP Recommended
HP EliteBook 840 G8 Notebook PC (26D63AV)
Microsoft Windows 10 (64-bit)

Hi, I am a System Admin for the company i work for. We purchase HP Products (ie Elitebooks\ZBooks) When purchasing these products in the past we also purchase the cube docking stations Thunderbolt G2-G3 models. My VP of I.T. decided the price was to expensive and to look for an alternative for docking station use. I found and purchase several docks with USB_C connections. After using these for some time, now i'm running into an issue where they are causing problems, For instance (Connected but not charging the battery, One or More monitors stop working, No network connection, external camera is intermittent) the list goes on and on. When looking in device manager I see this error in UCM ( UCM-UCSI ACPI Device Error 43) I searched google for a resolve and so far nothing has worked for me. The laptops are Elitebook 840 G9 Win10 Pro 64bit ver22H2 build 19045.3636 

Has anyone else run into this? If so what was your solution to resolving this? any assistance is appreciated.

2 REPLIES 2
HP Recommended

I have the same issue on an 840 g9 using an up to date hp g5 essential dock, however,  it only happened after installing the latest updates using hpia.

 

Most say just uninstall it, then shut down. This has not worked for me.

 

I found another that said to let the system run on battery until it dies. Not sure how that would fix but apparently it did for 2 people. In the process of trying this now. 

 

Last resort would be to reimage the machine. 

HP Recommended

Scratch that. I used HP support Assistant and ran the updates from there. I no longer have a warning for ucm-acpi in device manager. The dock works fine, as well as all accessories that are attached. From now on, I'll be using that instead of hpia to install updates. 

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