xdg-desktop-portal-gtk: 100% cpu usage and no print-dialog shown

[antoniocorbi]

Nixpkgs version

• Stable (25.11)

Describe the bug

Hi!
I'm using niri as my wayland compositor.
I've configured niri to use xdg-desktop-portal-gtk for printing like this: config.niri."org.freedesktop.portal.Print" = [ "gtk" ]; but trying the gnome portal the problem persists.

Trying to print from any application that uses xdk-desktop-portal-(gtk, gnome) to show a print dialog makes xdg-desktop-portal-gtk (in my case) use 100% cpu usage and the print dialog isn't shown.

The printer works ok from the command line using i.e. lpr.

The journalctl --user -u xdg-desktop-portal-gtk.service -f doesn't show any relevant information

Steps to reproduce

Try to print from any application like firefox, papers, geany, etc...

Expected behaviour

Show a print dialog and let the user print the document.

Screenshots

Relevant log output

journalctl --user -u xdg-desktop-portal-gtk.service -f

ene 07 18:34:56 acb-nixos systemd[2211]: Starting Portal service (GTK/GNOME implementation)...
ene 07 18:34:56 acb-nixos systemd[2211]: Started Portal service (GTK/GNOME implementation).

Additional context

I don't know since this problem is happening as I don't usually print.

System metadata

• system: "x86_64-linux"
• host os: Linux 6.18.3, NixOS, 25.11 (Xantusia), 25.11.20260105.3c9db02
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.32.4
• channels(root): "nixos-24.05, nixpkgs-unstable"
• nixpkgs: /nix/store/05zq22ry219543phf7q87d883kxl6ry7-source

Notify maintainers

@jtojnar

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