In reply to @jtojnar:matrix.org
gnome-settings-daemon is the component responsible for managing keybindings. For example, I get Failed to grab accelerator for keybinding when I switch to a home-manager config with conflicts.

❯ journalctl -b | grep .gsd-media-keys
Jul 06 15:54:14 mifla .gsd-media-keys[1457]: Failed to grab accelerator for keybinding settings:playback-repeat
Jul 06 15:54:14 mifla .gsd-media-keys[1457]: Failed to grab accelerator for keybinding settings:hibernate
Jul 06 15:54:21 mifla .gsd-media-keys[1457]: Unable to get default sink
Jul 06 15:54:21 mifla .gsd-media-keys[1457]: Unable to get default source
Jul 06 15:54:23 mifla .gsd-media-keys[2483]: Failed to grab accelerator for keybinding settings:hibernate
Jul 06 15:54:23 mifla .gsd-media-keys[2483]: Failed to grab accelerator for keybinding settings:playback-repeat
Jul 06 15:54:23 mifla .gsd-media-keys[2483]: Failed to grab accelerator for keybinding settings:screensaver
Jul 06 15:54:23 mifla .gsd-media-keys[2483]: gvc_mixer_card_get_index: assertion 'GVC_IS_MIXER_CARD (card)' failed
Jul 06 15:54:34 mifla systemd[2065]: Started Application launched by gsd-media-keys.
Jul 06 15:59:33 mifla systemd[2065]: Started Application launched by gsd-media-keys.
Jul 06 15:59:43 mifla systemd[2065]: Started Application launched by gsd-media-keys.
Jul 06 16:01:45 mifla systemd[2065]: Started Application launched by gsd-media-keys.
Jul 06 16:08:36 mifla systemd[2065]: Started Application launched by gsd-media-keys.
Jul 06 16:15:02 mifla systemd[2065]: Started Application launched by gsd-media-keys.

Okay so nixos-rebuild --switch as ever restores my keys. Finding activate script:

systemctl show home-manager-silas.service | grep Exec

❯ cat activate | grep dconf
_iNote "Activating %s" "dconfSettings"
  /nix/store/83mizl0zb58zzyby47rk7iafa1mrrrmr-dconf-cleanup \
    "$oldGenPath/state/dconf-keys.json" \
    "$newGenPath/state/dconf-keys.json"
$DRY_RUN_CMD $DCONF_DBUS_RUN_SESSION /nix/store/bll3yc6g3fc6bgxrs97idjxx27qkn9n2-dconf-0.40.0/bin/dconf load / < /nix/store/6676vj0l7kawrqkblqqicyjl3gc99im6-hm-dconf.ini

Now my settings are back:

[org/gnome/shell/keybindings]
open-application-menu=@as []
toggle-message-tray=@as ['<Super>v']
toggle-overview=@as []

After restart, broken:

❯ systemctl show home-manager-silas.service | grep ExecStart=
ExecStart={ path=/nix/store/fqhlc4pka1a9yx5dfy392abxlkibf9hv-hm-setup-env ; argv[]=/nix/store/fqhlc4pka1a9yx5dfy392abxlkibf9hv-hm-setup-env /nix/store/rqyhp24x4cha7qx70i71rq0s32sd7hs1-home-manager-generation ; ignore_errors=no ; start_time=[Thu 2023-07-06 16:18:51 CEST] ; stop_time=[Thu 2023-07-06 16:18:52 CEST] ; pid=941 ; code=exited ; status=0 }

After nixos-rebuild --switch (working):

❯ systemctl show home-manager-silas.service | grep ExecStart=
ExecStart={ path=/nix/store/dpalk76wpvnyfhnr2byxmhnpxrimbal7-hm-setup-env ; argv[]=/nix/store/dpalk76wpvnyfhnr2byxmhnpxrimbal7-hm-setup-env /nix/store/b4pclvgfkw8q6rvpir9zh28dms149br4-home-manager-generation ; ignore_errors=no ; start_time=[Thu 2023-07-06 16:22:06 CEST] ; stop_time=[Thu 2023-07-06 16:22:07 CEST] ; pid=5368 ; code=exited ; status=0 }

In reply to @tommy:datenkollektiv.net
Hey there. I use GNOME and NixOS and have a small but annoying problem: there are a couple of users on my system and the GDM3 login screen only shows two of them. The most used user account isn't part of this list hence the login procedure is to select "other user" and then enter the name manually. I therefore ask myself if there is a way to define the number of users in the list of the login screen or their order? Does anybody know by chance?