Thunderbolt dock not working well with PC

[ViRRO]

Hey all,

 

I have the following situation: I want to connect all my peripherals and (two) monitors to my Dell WD19TB Thunderbolt dock.

The goal is to have the same Dock connected to either my work M1 Pro or my home PC so I can quickly switch between them.

 

I have headphones, a mouse, a keyboard, and two monitors connected to the dock. One of the monitors is connected to the display port, and the other is connected to the USB-C/HDMI port (The display port + normal HDMI port were not working for Mac).

 

After some troubleshooting, I was able to make it work perfectly on Mac, but my PC doesn't recognize the monitors if they are not directly connected to the graphics card. Other peripherals work fine on PC.

I played around with the Thunderbolt settings on my BIOS, but it's all enabled, and I couldn't find anything missing.

 

I have a ASRock Z790 Taichi and a 7900XTX.

 

I really appreciate any help you can provide.

[DrMacintosh]

I think PCs have a Thunderbolt app. You could try finding it and seeing if there are any settings you need to change.

[ViRRO]

Hey @DrMacintosh! Thanks for your answer.

 

Im using the Intel Thunderbolt control center, but it doesn't help much.

[DrMacintosh]

Wait, so your motherboard has a thunderbolt port on it? Does your board also have support for GPU pass through or some internal connectors? I know some older boards had internal display port headers to pass the video through the thunderbolt port. In order for to do video over thunderbolt the graphics card needs to be connected to the thunderbolt controller in some way.

[Senzelian]

This is most likely the problem:

 

 

You will need to get a different motherboard to pass a display signal through Thunderbolt from your graphics card.

[ViRRO]

Thanks for all the replies.

 

After enabling "IGPU Multi-Monitor" and setting "Share memory" to Auto in the chipset options the HDMI over USB-C (connected to the dock) works, but the DP cable still needs to be connected directly to the graphics card. Any suggestion?

 

 

[Senzelian]

13 minutes ago, ViRRO said:

Thanks for all the replies.

 

After enabling "IGPU Multi-Monitor" and setting "Share memory" to Auto in the chipset options the HDMI over USB-C (connected to the dock) works, but the DP cable still needs to be connected directly to the graphics card. Any suggestion?

 

 

You realize that if your monitors are connected to your IGPU your 7900XTX becomes essentially useless, right?

 

Also, no idea why DP won't work. Sometimes DP can be a bit finicky. 

[ViRRO]

@Senzelian It looks like the GPU is the one doing the hard-lift even when playing on the HDMI monitor. Ill keep monitoring, tho.
Also I still have no idea why DP does not works. Ill update the thread if I ever findout.

[ViRRO]

Just to update the thread. Indeed the main GPU is not being used, I dont think my motherboard supports passtrhough.