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Second external monitor does not work via USB-C to HDMI adapter

mx flag

I'm using Xubuntu 21.10. I have an ASUS Zephyrus G14 laptop with two video cards. One integrated on the AMD Ryzen 9 5900HX CPU and another one Nvidia RTX-3060. I have an external monitor connected to the HDMI port. I connected a second external monitor via a USB-C to an HDMI adapter. I have dual boot with Windows 11 and the setup works on Windows. But the Ubuntu cannot detect the second external monitor. Initially, the setup was not working even on Windows but it started to work after a while. I suspect that this is because Windows downloaded some drivers in the background. I tried with both the latest Nvidia driver available via the Additional Drivers menu and with the open-source drivers for the video card, but it is not working in both way. Does someone know how to make the second external monitor work?

ChanganAuto avatar
us flag
When you tried the Nvidia drivers did you used mokutil to enable them with Secure Boot (required for Windows 11) and used the Nvidia X Server Settings app/tool to enable Nvidia instead of the iGPU? If either of this conditions wasn't met then it not working with the external monitor is to be expected. Please [edit] the question accordingly.
bobeff avatar
mx flag
@ChanganAuto I'm not sure. Could you explain which are the steps to do it the right way?
ChanganAuto avatar
us flag
https://gist.github.com/bitsurgeon/b0f4440984c9e60dcd8fe8bbc346c029 or, even better, https://www.itzgeek.com/post/how-to-install-nvidia-drivers-on-ubuntu-20-04-ubuntu-18-04.html
bobeff avatar
mx flag
@ChanganAuto Yes, I have secure boot enabled and I choose Nvidia in the Nvidia X Server Settings. The result is the same.
bobeff avatar
mx flag
@ChanganAuto > If either of this conditions wasn't met then it not working with the external monitor is to be expected. Do you understand that I already have one external monitor working? I'm trying to connect a second one via HDMI to a USB-C adapter.
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