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#1 2020-09-16 03:43:31

Ieter
Member
Registered: 2020-09-16
Posts: 4

Multi-gpu multi-monitor system xorg/display issues

Hello!

I have 3 monitors and 2 GPUs. I got a rx 5700xt (mesa) and a rtx 2060 super (nvidia). I want my main monitor to be running off my 5700xt and my 2 secondary monitors to be running off my 2060.
Ive gotten to the point where xorg has all the monitors setup in the way I want, but the 2 secondary monitors are not displaying anything but a black screen. I am able to move things off my main screen and onto the other screens, but nothing is displayed. The monitors are on and detecting, but they are just displaying black.
Any idea how to fix this? I've been working on it for 2 days now and I've finally realized its above my skill and research level.

https://termbin.com/z5i53 xorg.conf
https://termbin.com/c7l2  xorg.conf.d/05-device.conf
https://termbin.com/oe0g xorg.conf.d/10-monitor.conf
https://termbin.com/4x12l Xorg.0.log

Using:
Arch x86_64
5.8.9-zen2-1-zen
xfce4

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#2 2020-09-16 03:48:10

Ieter
Member
Registered: 2020-09-16
Posts: 4

Re: Multi-gpu multi-monitor system xorg/display issues

Context to this is i was attempting to do sli/crossfire with both cards before i realized thats dumb and you cant do that, so i decided i could just use the 2060 for my secondary monitors and use the 5700xt on my main monitor. i want to get the most possible performance out of the 5700xt, so having it render only one monitor should help.

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#3 2020-09-16 03:55:33

Ieter
Member
Registered: 2020-09-16
Posts: 4

Re: Multi-gpu multi-monitor system xorg/display issues

https://termbin.com/1lmr dmesg. just remembered it existed.

 nvidia 0000:21:00.0: cannot be used for peer-to-peer DMA as the client and provider (0000:2d:00.0) do not share an upstream bridge or whitelisted host bridge 

that doesn't look good.

https://termbin.com/ddm2 nvidia-bug-report.sh

Last edited by Ieter (2020-09-16 04:00:38)

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#4 2020-09-16 04:59:54

Ieter
Member
Registered: 2020-09-16
Posts: 4

Re: Multi-gpu multi-monitor system xorg/display issues

It seems the X server can only be rendered on one or the other. I can either render the the middle screen (5700XT) or the secondaries (2060S). does anyone know of a way to render both?

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#5 2020-09-16 08:49:22

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 10,455

Re: Multi-gpu multi-monitor system xorg/display issues

Please edit rather than bump your post if you want to add new information.

I assume (though no hands on knowledge/experience) you should be able to do is start two distinct xorg servers that can't interact with each other beyond where your mouse/keyboard focus is and then make that dependant on where which program runs on

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