Support multi-gpu mosaic

[gilvbp]

Is there schedule to fix wayland protocol/compositor issues? (https://download.nvidia.com/XFree86/Linux-x86_64/525.78.01/README/wayland-issues.html)

Any plans to multi-gpu mosaic support ?

Regards

[erik-kz]

Fixing such issues will involve collaboration with the community, so it's difficult to commit to a schedule since things aren't entirely within our control. Multi-GPU mosaic is definitely on the roadmap, and considered a high-priority features.

[gilvbp]

Thanks for the reply.
I'm worried about this because Gnome and others DE already have to plans to remove x11 session.

Reference:
https://gitlab.gnome.org/GNOME/gnome-session/-/merge_requests/99

[gilvbp]

Hi @erik-kz, any updates on multi-gpu mosaic feature?

[erik-kz]

We're currently working on enabling multi-GPU support in EGL which represents one step towards supporting this feature.

[gilvbp]

We're currently working on enabling multi-GPU support in EGL which represents one step towards supporting this feature.

Sounds great! Thanks for the info!

[gilvbp]

Hi @erik-kz, any updates? Thanks

[gilvbp]

It is resolved on 560 drivers. https://forums.developer.nvidia.com/t/bug-wayland-egl-applications-not-working-with-dual-nvidia-gpus/285024/9

[xhertan]

This issue is not solved. I have a worksation with two Quadro RT5000 (NVLINK) with two screens and switching to wayland only display the pointer on the second screen. It works perfectly fine with X11.
OS: Fedora 40
NVIDIA Driver Version: 560.35.03

[gilvbp]

This issue is not solved. I have a worksation with two Quadro RT5000 (NVLINK) with two screens and switching to wayland only display the pointer on the second screen. It works perfectly fine with X11. OS: Fedora 40 NVIDIA Driver Version: 560.35.03

Yes, you're right! I opened another issue here: #152

[gilvbp]

@xhertan Hi, on cosmic epoch is working fine, maybe sway too. They use vulkan, not egl.

[xhertan]

@xhertan Hi, on cosmic epoch is working fine, maybe sway too. They use vulkan (wlroots), not egl.

@gilvbp Hi, Thanks for the info. But, I don't like Cosmic, it has not the quality level of Gnome has. Have you tried with KDE if this is working on it?

[gilvbp]

@xhertan Hi, on cosmic epoch is working fine, maybe sway too. They use vulkan (wlroots), not egl.

@gilvbp Hi, Thanks for the info. But, I don't like Cosmic, it has not the quality level of Gnome has. Have you tried with KDE if this is working on it?

Yes, I did, same problem. Kde uses egl, and it's an egl problem. There's no schedule date to be fixed #152 (comment). I doubt they fix that because nvidia is focusing only on vulkan, not egl.

Abou kde, you have to wait for the vulkan backend feature to be completed https://invent.kde.org/plasma/kwin/-/merge_requests/5602 .

About Gnome, they don't have plans to use vulkan backend.

[xhertan]

@gilvbp Hi, I tried cosmic and this is working fine for some minutes and it behaves as we reported, only displaying the pointer on the second screen.

[gilvbp]

Delete the egl-wayland package from system. After that, a few electrons apps and gtk3 apps could cause black scren with mouse cursor( most of the cases on tilling mode using 2 window splits). If it occurs, just close and move the app to another monitor.

[xhertan]

@gilvbp Thanks for the info. I tried cosmic and it is unpleasant for me, so I will continue with gnome X11 that is working fine with the aforementioned configuration.

[gilvbp]

@gilvbp Thanks for the info. I tried cosmic and it is unpleasant for me, so I will continue with gnome X11 that is working fine with the aforementioned configuration.

You're welcome.

[gilvbp]

@gilvbp Thanks for the info. I tried cosmic and it is unpleasant for me, so I will continue with gnome X11 that is working fine with the aforementioned configuration.

@xhertan check this: #152 (comment)

[xhertan]

@gilvbp Thank you for the info. It looks like we will have KDE working with this soon. Hopefully, mutter can make the changes to get this working on gnome soon. Is there a report tracking this on mutter side to get this working on Gnome?

[gilvbp]

@gilvbp Thank you for the info. It looks like we will have KDE working with this soon. Hopefully, mutter can make the changes to get this working on gnome soon. Is there a report tracking this on mutter side to get this working on Gnome?

Here: https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4182 and https://gitlab.gnome.org/GNOME/mutter/-/issues/3733