I just bought a Razer Core X Chroma in combination with a Gigabyte RTX 3070. These are used in combination with a HP Zbook studio which supports thunderbolt 3. I use a fresh install of Ubuntu 20.04 LTS as my operating system.

To configure the eGPU I used the following tutorial:

I also searched the internet for solutions which caused me to perform the following actions

• I set the ‘Thunderbolt Security Level’ to ‘PCIe and DisplayPort - No Security’ in the bios.
• In the xorg.conf file I also added ‘Option “AllowExternalGpus” “True”’ to the devices sections of the Geforce RTX 3070.
• I use lightdm as my display manager, instead of gdm3
• I updated the drivers to nvidia-driver-460

Everything seems to work fine since the eGPU is recognized by nvidia-smi:Screenshot of nvidia-smi command

Also the external displays which are attached with hdmi to the eGPU are recognized by NVIDIA X Server Settings.

The problem is that the external displays are showing my cursor (as a weird cross), but are not recognized as displays in the Ubuntu settings and do not show any windows. Therefore I am not able to use the external monitors. Does anyone know a solution to this problem?

1 Answer

I found the following GitHub:

Running this solved the problem for me.

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