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gmontaltog
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Solved!

USB-C to Displayport and USB-C to VGA adapters not recognized any more

HP Recommended
Elitebook 840 G7
Microsoft Windows 10 (64-bit)

Hello,

 

my  HP USB-C to Displayport and USB-C to VGA adapters have been working fine for a few month. 

One day, I locked Windows before leaving my desk for lunch and, when I got back, I find out the notebook had rebooted.

Since then, both the display adapters stopped working on my laptop.

 

some more details:

- Both the adapters are HP branded (no third party)

- The adapters are actually OK: they still work fine when connected to another laptop

- the laptop's native HDMI port actually works

- the HP USB-C to Ethernet adapter works fine on the laptop too

- Windows recognizes both the adapters, but installs them as "Billboard Device"

 

This means that, when connecting the adapter(s), the USB-C Alternate Mode negotiation fails and, since they used to work in the past, I suspect it's a USB-C hardware fault.

 

any suggestion?

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gmontaltog
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HP Recommended

Solved...by replacing the motherboard!

The USB-C controller was broken.

View solution in original post

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AbbyY11
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HP Recommended

@gmontaltog wrote:

Hello,

 

my  HP USB-C to Displayport and USB-C to VGA adapters have been working fine for a few month. 

One day, I locked Windows before leaving my desk for lunch and, when I got back, I find out the notebook had rebooted.

Since then, both the display adapters stopped working on my laptop.

 

some more details:

- Both the adapters are HP branded (no third party)

- The adapters are actually OK: they still work fine when connected to another laptop

- the laptop's native HDMI port actually works

- the HP USB-C to Ethernet adapter works fine on the laptop too

- Windows recognizes both the adapters, but installs them as "Billboard Device"

 

This means that, when connecting the adapter(s), the USB-C Alternate Mode negotiation fails and, since they used to work in the past, I suspect it's a USB-C hardware fault.

 

any suggestion?


That happened to me as well, but I am using HP envy x13 laptop, everything was working fine but suddenly its not working anymore 

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gmontaltog
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Message 3 of 3
Flag Post
HP Recommended

Solved...by replacing the motherboard!

The USB-C controller was broken.

View solution in original post

Was this reply helpful? Yes No
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