Gnome power button behavior when session is locked

Help
1

I have the following setting in my Gnome image settings:

image

However this setting doesn’t change anything for the behavior of the power button on the login screen - when my session is locked. I found this promising Arch Wiki suggestion:

# /etc/dconf/db/gdm.d/05-power
[org/gnome/settings-daemon/plugins/power]
power-button-action='action'

But I’m not sure, what is the NixOS equivalent of that /etc/dconf/db/gdm.d/ directory? These available settings, linked by the services.xserver.displayManager.gdm.settings option documentation, don’t mention the dconf settings mentioned in the Arch Wiki article.

2

You can do that with the dconf NixOS module. See gdm.nix for an example.

3

Thanks a lot! It was exactly what I was looking for. I was worried a bit that overriding that adding something to the programs.dconf.profiles.gdm.databases would wipe out previous additions to this list, but it turned out to be OK. For reference, here’s what I added:

    # By default, in GDM's lock screen the power button does nothing. This
    # fixes this behavior to match the behavior of the desktop environment
    # https://wiki.archlinux.org/title/GDM#Configure_power_button_behavior
    programs.dconf.profiles.gdm.databases = [{
      settings."org/gnome/settings-daemon/plugins/power" = {
        power-button-action = "suspend";
      };
    }];