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3 Posts

06-29-2021

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USB-C to dual HDMI dock, intermittently connecting

2021-06-29, 12:04 PM

I have a new Yoga 9 and have set up a dual Dell 27inch monitor setup connected to a USB powered (100W) dual HDMI hub that is connected to the laptop via USB-c.

 

The monitors sometimes say no signal is detected when the USB is connected and I have to reconnect it a few times to get it to work. Also if I turn off the laptop and turn it back on, the monitors say no signal is detected and I need to reconnect to get it to connect.

 

Any idea what's going on and how I can fix. I've reinstalled Dell drivers for the monitors and also the most up to date graphics driver from intel.

 

HELP!

 

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4164 Posts

12-13-2016

United States of America

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Re:USB-C to dual HDMI dock, intermittently connecting

2021-06-29, 12:47 PM

Welcome to the Community

 

To help others help you, it might be good to post some more information.

 

1. Which Yoga 9 computer do you have? Include the ten-character MTM number if you can. It's on the bottom, usually. Looks like this: 82DE000AUS. Don't post the serial number.

 

2. What's the make and model of the dock you're using?

 

3. Which OS and version? For example, Windows 10 Pro, version 20H2

 

4. What's the model number of the Dell monitors?

 

Thanks

 

Doc


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1 Posts

06-30-2021

United States of America

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Re:USB-C to dual HDMI dock, intermittently connecting

2021-06-30, 4:06 AM

I'm having a similar issue with a Lenovo/Yoga 7 15ITL5.  The monitors, connected to a USB C hub, will intermittently shut down with a message of "power saver mode". I have tried everything I could find to resolve but to no avail.  Including the power settings on the notebook.

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160 Posts

04-26-2020

United Kingdom of Great Britain and Northern Ireland

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Re:USB-C to dual HDMI dock, intermittently connecting

2021-06-30, 9:52 AM

I had the same on my C940. You need to make sure the dock is Thunderbolt certifed. then it works every time.

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3 Posts

06-29-2021

Australia

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Re:USB-C to dual HDMI dock, intermittently connecting

2021-06-30, 10:55 AM
The laptop is a Yoga 9 14 ITL5 I'm connecting via a hub from Lention (https://www.lention.com/collections/usb-c-hdmi-and-hdmi-cable/products/lention-usb-c-hub-with-4-usb3-cbtpc45) This is working on my other laptops. I'm running Windows 10Windows Pro Version 21H1 I've connected the power brick (USBC), and both HDMI cables into the unit. Both monitors are Dell H2721SN
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160 Posts

04-26-2020

United Kingdom of Great Britain and Northern Ireland

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Re:USB-C to dual HDMI dock, intermittently connecting

2021-06-30, 11:01 AM
As stated above, your dock isn't thunderbolt 4 compatible so won't work properly. Been down ths very long road with the C940 as it's practically the same machine.
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3 Posts

06-29-2021

Australia

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Re:USB-C to dual HDMI dock, intermittently connecting

2021-06-30, 11:32 AM
Oh Really, that sucks. I'll message the manufacturer of the dock. So if I buy another dock it should be fine?
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160 Posts

04-26-2020

United Kingdom of Great Britain and Northern Ireland

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Re:USB-C to dual HDMI dock, intermittently connecting

2021-06-30, 11:34 AM

As long as it's Thnderbolt 4 certified. They are difficult to find and more expensive.

 

The cheap Chinese ones from Amazon definitely aren't.

 

The one I finally got to work was Anker I think.

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