Dual External Display with Radeon 680M

[RayDude]

I lost my second monitor when I was laid off from my previous job in 2023.

I just got a new one and I can't get it to work with my Lenovo Legion 16ARH7H.

I think it used to work. I remember using it. My older work laptop was limited to 30Hz on the second 4K display, but that was okay. I thought this one could do two at 60 Hz.

I have the Nvidia 3060 maxQ dedicated to a VM that works really well and comes up with dual displays if I connect the left side front most USBC to HDMI and the rear HDMI to another monitor. Neat! But that's not what I want. I want both 4K displays to work on the 680M.

I know that the HDMI on the back of the laptop is only connected to the Nvidia RTX3060, but I thought the left side front most USBC connector could be switched.

The left side rear USBC is up and running just fine. Even at 160 Hz!

I can't remember the trick.

Does anyone know how to do it?

Thanks in advance.

[Hu]

In what way does this fail? Are you using Xorg or Wayland for your display? If Xorg, does xrandr acknowledge the monitor? Does the monitor contribute to your display space, such that you can move windows off the working screen to a place where they ought to appear on the non-working monitor? Does the non-working monitor claim "No input signal" or does it show a powered up blank screen?

[RayDude]

In what way does this fail? Are you using Xorg or Wayland for your display? If Xorg, does xrandr acknowledge the monitor? Does the monitor contribute to your display space, such that you can move windows off the working screen to a place where they ought to appear on the non-working monitor? Does the non-working monitor claim "No input signal" or does it show a powered up blank screen?

The display does not show up. The USB billboard device is recognized but the display is not.

The non-working monitor stays in standby mode.

But if I run the Nvidia VM, it comes up.

It might be that I'm remembering things wrong. There may not be a mux on this display it may be only connected to the nvidia GPU.

I bought a USBC to dual Display Port adapter that claims I can do dual display 4K at 60 Hz. If that works I'll probably call it good enough.

I tried to get nouveau running but it looks like it doesn't support the RTX 3060 mobile yet.

I tried getting the nvidia binaries working but ... That's not what I want and I apparently still have to generate an xorg.conf so I gave up for now.

I'll try the splitter tomorrow and see if it works.

I half tempted to see if windows 11 can drive all displays on the radeon GPU, but that's a lot of work just to see if it's possible.

Thanks for the response.

[RayDude]

I'm not sure it ever worked before. I might have given up after I decided to have the Windows VM.

However, this device solved my problem: https://www.amazon.com/DisplayPort-Disp ... B0BY2JMF9L

I plugged that in where the USB C to single DisplayPort adapter used to be and plugged both monitors into it and voila! I have dual monitors on my iGPU. They are both running at max resolution, max refresh as well, which is amazing.

And the laptop internal display still works as well, although I shut it off because with dual 4K I don't need a 2K display in my way.

Hopefully this will help someone else in the future.