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Looking to migrate
(suppo.fi)
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this post was submitted on 21 Sep 2023
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It sounds like you're trying to plug in multiple monitors across different GPUs...that's a recipe for disaster. Plug all monitors into a single GPU. If you've got a 4070, you're already more than capable of 4+ monitors on that card, what are you doing exactly?
Only good reason for doing what you're doing is for something like GPU passthrough in proxmox where you're passing your DGPU through to a virtual machine.
The integrated GPU in the 7900 is exceptionally weak, and generally only good for "home office" use.
How would hooking up everything to the GPU be beneficial when it comes to GPU passthrough?
Albeit is it even necessary these days.
If you're doing GPU passthrough, then you'd have a dedicated monitor on the iGPU just for managing VMs, and you'd have a second monitor hooked up to the dGPU and it would initialize with the VM bootup. If what you're trying to do is just get multiple monitors on a linux install, then you should just disable the iGPU and don't plug anything into it at all, and only use nVidia driver stack for your setup.
I don't know what problem you're trying to solve exactly. Are you looking to do GPU passthrough on VMs, or are you just trying to get a standard multi-monitor setup on a gaming PC? What, exactly?
iGPU shares one monitor with the dGPU, but on different protocol, which from what I read online is supported.
It only really needs output when I flick it open.
So maybe it needs a KVM switch instead of trusting the monitors splits.
It's possible you need a dedicated KVM for swapping the input of the iGPU/dGPU shared monitor. If the dGPU is only getting passed through to a VM, I don't believe it will initialize until the VM explicitly takes control of it.
And I think vGPU passthrough is disabled on consumer Ada/Ampere architectures unless there's been a crack developed for it since then?
The turing architecture (RTX 20 series) is the only one I know of that has a crack/drivers available for it but I may be wrong/out of date on that info.