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machines.coaxmetal: strom gamepad kiosk + auto max brightness
Autostart the strom couch launcher fullscreen via services.cage on boot
(after LUKS unlock), always pulling the newest launcher with nix run.
Dedicated strom kiosk user; force backlight to max on boot and let the
video group adjust brightness via brightnessctl udev rules.
author
lassulus
date
(Jul 25, 2026, 11:28 PM CEST)
commit
ba556c34
ba556c349b85d2c62fb4b4c827917e96cb8cbd7c
parent
d845c9f0
d845c9f01d81cbfae347ff0b7ccf054b5af73202
+72
+1
machines/coaxmetal/config.nix
+1
machines/coaxmetal/config.nix
+71
machines/coaxmetal/strom.nix
+71
machines/coaxmetal/strom.nix
···
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{
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config,
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lib,
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pkgs,
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...
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}:
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let
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# Always pull the newest launcher straight from the public flake instead of
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# pinning it as an input, so the game grid tracks upstream on every (re)launch.
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# The launcher itself only shells out to `nix run <flake>#<slug>` per game, so
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# its closure stays tiny; games bring their own nested gamescope/proton.
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strom-session = pkgs.writeShellScript "strom-session" ''
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set -u
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# Relaunch whenever the couch launcher exits (gamepad B / Esc) so the kiosk
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# never drops to a blank tty. Keeping the loop as cage's child means the
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# compositor stays up across relaunches.
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while true; do
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${config.nix.package}/bin/nix run --refresh github:kraftwerk-gaming/strom#scripts.launcher
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sleep 2
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done
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'';
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in
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{
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# Dedicated, unprivileged kiosk user. Gamepad input comes through evdev
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# (input group), audio through the system-wide pipewire socket (pipewire
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# group), and the games need video/audio like any local player.
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users.users.strom = {
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isNormalUser = true;
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extraGroups = [
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"video"
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"audio"
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"input"
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"pipewire"
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];
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};
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# Kiosk autostart. After the initrd ZFS/LUKS unlock hands off to the running
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# system, graphical.target pulls up cage on tty1, which logs the strom user
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# in with no prompt and runs the fullscreen launcher as its sole Wayland
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# client. This is the canonical NixOS single-app kiosk path.
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services.cage = {
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enable = true;
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user = "strom";
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program = strom-session;
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};
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# Recover the compositor itself if it ever crashes (the session loop above
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# already handles a launcher exit without tearing cage down).
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systemd.services.cage-tty1.serviceConfig = {
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Restart = lib.mkDefault "always";
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RestartSec = 2;
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};
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# The panel comes up at ~1% backlight, unreadable for a couch setup. Ship
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# brightnessctl + its udev rules (chgrp backlight to the video group, g+w) so
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# any video-group user (strom, lass) can adjust it without root, e.g.
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# `brightnessctl set 100%` / `brightnessctl set 50%`.
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environment.systemPackages = [ pkgs.brightnessctl ];
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services.udev.packages = [ pkgs.brightnessctl ];
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# Force the backlight to maximum on every boot. Ordered after
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# systemd-backlight, which would otherwise restore the last (dim) saved level.
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systemd.services.max-brightness = {
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wantedBy = [ "multi-user.target" ];
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after = [ "systemd-backlight@backlight:amdgpu_bl1.service" ];
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serviceConfig = {
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Type = "oneshot";
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ExecStart = "${pkgs.brightnessctl}/bin/brightnessctl set 100%";
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};
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};
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}