Monitors connected through the dock are blank on Wayland but work fine on X11 (Ubuntu 24.04)

[zjeffer]

• Are you using the latest driver? Yes
• Are you using the latest EVDI version? Yes
• If you are using a DisplayLink device, have you checked 'troubleshooting' on DisplayLink's website? Yes
• Is this issue related to evdi/kernel? Yes

• Linux distribution and its version: Ubuntu 24.04
• Linux kernel version: 6.8.0-40-generic
• Xorg version (if used) 7.7+23ubuntu3, core: 21.1.12-1ubuntu1
• Wayland version: libwayland-server0:amd64 1.22.0-2.1build1
• Desktop environment in use: gnome 46.0
• GPU: Nvidia RTX 3070 Laptop
• GPU Driver: nvidia-550 (proprietary)
• CPU: AMD Ryzen 7 5800H

I have a Dell D6000 docking station connected to my Lenovo Legion 5 Pro laptop. Everything works (keyboard & mouse through usb, ethernet), but my monitors do not display anything on Wayland. Connecting the cable turns on the monitor but then it goes to standby because it gets 'No signal'.

On X11, everything works fine. On Windows too.

• dmesg logs when reconnecting an HDMI 1920x1080@60 monitor to my dock on Wayland, with evdi verbose logging (level 6) (disconnecting, waiting a couple seconds, then reconnecting again): evdi-wayland.log. Reconnection happens between the empty lines I added.

• dmesg logs when reconnecting (same thing as above) on X11: evdi-xorg.log. I left some newlines on lines 63-67 to show where I reconnected.

• Xrandr output on Xorg, with the monitor connected (DVI-I-1-1): xrandr-xorg.log.

I compared the logs and noticed that on Wayland, after the Edid property is set, it immediately logs evdi_user_framebuffer_destroy, evdi_painter_close, and evdi_driver_close. These logs don't occur on X when connecting the monitor.

On Wayland, the monitor (Acer, id=3, my second monitor is connected directly to my laptop and works fine) is connected properly, shows the correct size, resolution, name, etc:

But the monitor doesn't get a signal.

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I also notice that when I use the nouveau drivers instead of the proprietary Nvidia drivers, the monitor does get a signal, but only shows the cursor, the background is black and I can't move windows to the monitor. Either way, using nouveau isn't an option, as I'm planning to use this dock on Hyprland, and play games: both of which aren't great with nouveau. But this info might be useful to determine the cause.

Let me know if you need any other logs.

[zjeffer]

On Hyprland, reconnecting a monitor has the same behaviour but different logs: evdi-hyprland.log

dmesg logs when reconnecting a monitor, with debug drm logs enabled (grep on evdi): dmesg.log

[zjeffer]

Seems it happens due to the combination Nvidia + Wayland: I see the same behaviour on KDE + Wayland and on Hyprland when using Nvidia, but when running them on my AMD Integrated GPU it works fine. My other laptop with Intel integrated GPU also works fine.

Is this the right place to report this? Or should I report it to the nvidia forums?

[zjeffer]

Still doesn't work with nvidia-560 drivers.

[zjeffer]

Created a thread in the nvidia forums here: https://forums.developer.nvidia.com/t/displaylink-monitor-doesnt-get-signal-when-connected-through-docking-station-on-nvidia-wayland/304676

[honeyraptor]

@zjeffer
Were you able to resolve it?

I too am facing the same issue (Blank screen),

With
Ubuntu 24.04.1 LTS
Nvidia 550.120
Wayland.
Gnome 46
DisplayLink - displaylink-driver/stable, 6.1.0-17 amd64

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However the setup works well,
with X11.

[zjeffer]

No, still doesn't work. Tried again a few days ago with the latest evdi git commit, no difference. I'm on nvidia-565.77.

[honeyraptor]

@zjeffer
Yes,

• I too tried with evdi 1.14.7, without success...
• Tried latest nvidia 550.135(for my device) from nvidia website as well, didn't work either.

Lets hope the next release of Displaylink fixes it...

[zjeffer]

Good to hear I'm not alone with this issue :)
Which docking station do you use?

[honeyraptor]

@zjeffer
I am using Alogic Universal Twin HD Pro.