Unable to use Wayland after switching to nvidia proprietary drivers

[dmakwana]

Hi,
I recently installed debian 12, then I wanted to use the nvidia proprietary drivers instead of the noveau drivers. But after installing the drivers and cuda. I'm unable to use the three fingers gestures, I checked the

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echo $XDG_SESSION_TYPE

. And now it's outputting x11 instead of wayland. I followed this thread on the wiki. I have nvidia-smi, nvcc properly working, I have installed nvidia-cuda-toolkit, nvidia-suspend-common, nvidia-driver. Set the kernel parameter nvidia-drm.modeset. and

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cat /proc/driver/nvidia/params | grep PreserveVideoMemoryAllocations

outputs 1. I have enabled the required services nvidiasuspend.service, nvidia-hibernate.service, nvidia-resume.service.

[@ttila]

Are you using drivers from the official Debian repo??

1) If you use gdm3 in /etc/gdm3/custom.conf, do you have this enabled?:

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"WaylandEnable=true"

2) Have you installed these packages libnvidia-egl-gbm1 and libnvidia-allocator1? add libnvidia-egl-wayland1 too (egl hardware acceleration under wayland).
3) I assume in the /etc/default/grub file there is the line

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GRUB_CMDLINE_LINUX="nvidia-drm.modeset=1"

If not add it and launch as root with

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update-grub

The wiki says something different where save this setting.

[dmakwana]

Hi @ttila, Sorry for the late reply,
Yes, I am using drivers from the official Debian repo.
1) I just noticed that /etc/gdm3 doesn't have custom.conf file. which is strange because I installed the gnome from the installer, So, I guess it should use gdm3 by default.
2) I did not have those packages that you mentioned, but even after installing there is no change.
3) I have set the kernel parameter using the file /etc/default/grab. Here's the relevant line

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GRUB_CMDLINE_LINUX_DEFAULT="quiet nvidia_drm.modeset=1"

.

[@ttila]

1) I just noticed that /etc/gdm3 doesn't have custom.conf file. which is strange because I installed the gnome from the installer, So, I guess it should use gdm3 by default.
2) I did not have those packages that you mentioned, but even after installing there is no change.
3) I have set the kernel parameter using the file /etc/default/grab. Here's the relevant line

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GRUB_CMDLINE_LINUX_DEFAULT="quiet nvidia_drm.modeset=1"

.

Don't worry.
1) from the gdm debian wiki i read this:

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In Debian 10 and newer, GDM will use Wayland by default on supported hardware. This can be overridden in the /etc/gdm3/daemon.conf file by uncommenting the WaylandEnable=false line, forcing it to instead use X1

So the real config file is stored here "/etc/gdm3/daemon.conf". I use sddm and not gdm3.
2) my mistake those packages are needed when you use a wlroot compositor, Gnome/kde can use directly the EGL infrastructure. I use labwc and i need them.
3) perfect!!!

[dmakwana]

Thanks @ttila. The output of

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sudo cat /sys/module/nvidia_drm/parameters/modeset

. is Y, So I guess the kernel parameter is set correctly, It was using Wayland session before, but after trying to switch to nvidia proprietary drivers instead of nouveau created this problem. The value of

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echo $XDG_SESSION_TYPE

outputs x11. I don't know why it's not launching Wayland. I am not able to use the three finger gestures due to this. Maybe I'm missing something.

[@ttila]

It is important to set the "nvidia_drm.modeset=1" in early stage of booting process and the grub setting is right for you.
Did you edit the option "WaylandEnable=true" in "/etc/gdm3/daemon.conf"?

[fabien]

I don't know why it's not launching Wayland.

I think this post might help answer that question.