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fix: allow steamos-manager to override sddm config #553

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fix: allow steamos-manager to override sddm config #553

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f7a28b3
fix: allow steamos-manager to override sddm config
Titaniumtown Feb 27, 2026
3f8f6d8
steamos-manager: install steamos-manager-session-cleanup.service and …
Titaniumtown Feb 27, 2026
68f2a68
steamos-manager: install session cleanup service and SDDM boot failsafe
Titaniumtown Feb 27, 2026
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27 changes: 16 additions & 11 deletions modules/steam/autostart.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -73,20 +73,25 @@ in
to keep this behavior.
'';


# Disable NixOS's autologin config generation.
# We put autologin config in sddm.conf.d instead so that steamos-manager's
# zzt-steamos-temp-login.conf can override the session on Switch to Desktop.
# (SDDM reads conf.d files alphabetically, so zzt > 00)
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@K900 K900 Feb 27, 2026

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I fixed this in nixpkgs, this should not be necessary.

services.displayManager = {
autoLogin = {
enable = true;
user = cfg.user;
};
sddm = {
enable = true;
autoLogin.relogin = true;
};
defaultSession = "gamescope-wayland";
autoLogin.enable = lib.mkForce false;
sddm.enable = true;
};

# tell steamos-manager it's allowed to manage our session
environment.etc."sddm.conf.d/00-jovian-autologin.conf".text = ''
[Autologin]
User=${cfg.user}
Relogin=true
Session=gamescope-wayland.desktop
'';

# Sentinel file: tell steamos-manager it's allowed to manage our session
# Without it, the SessionManagement1 D-Bus interface
# (Switch to Desktop/Game Mode) is not registered.
environment.etc."sddm.conf.d/steamos.conf".text = "";

# Steam overrides this SOMETIMES seemingly for no reason
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5 changes: 5 additions & 0 deletions modules/steam/steam.nix
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Expand Up @@ -87,6 +87,11 @@ in
wantedBy = [ "gamescope-session.service" ];
};

systemd.user.services.steamos-manager-session-cleanup = {
overrideStrategy = "asDropin";
wantedBy = [ "graphical-session.target" ];
};

systemd.services.steamos-manager = {
overrideStrategy = "asDropin";
# FIXME: should probably be done upstream
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4 changes: 4 additions & 0 deletions pkgs/steamos-manager/default.nix
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Expand Up @@ -104,8 +104,12 @@ rustPlatform.buildRustPackage rec {
install -m644 "data/system/com.steampowered.SteamOSManager1.conf" "$out/share/dbus-1/system.d/"
install -m644 "data/system/steamos-manager.service" "$out/lib/systemd/system/"

install -d -m0755 "$out/lib/systemd/system/sddm.service.d/"
install -m644 "data/system/reset-oneshot-boot.conf" "$out/lib/systemd/system/sddm.service.d/"
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@K900 K900 Feb 27, 2026

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This will not do anything, because our service name is display-manager.service (for legacy reasons). It should probably be set in the NixOS module instead.


install -m644 "data/user/com.steampowered.SteamOSManager1.service" "$out/share/dbus-1/services/"
install -m644 "data/user/steamos-manager.service" "$out/lib/systemd/user/"
install -m644 "data/user/steamos-manager-session-cleanup.service" "$out/lib/systemd/user/"
'';

postFixup = ''
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