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NoSignal-OS/os updates/monitor-hotload/README.md
28allday 19fd794b6b NoSignal — fully-offline Arch → Hyprland desktop installer 
Single-script builder (nosignal.sh) that turns a stock Arch Linux ISO into a
fully-offline installer for a themed Hyprland + caelestia (Quickshell) desktop:
matching SDDM greeter, Btrfs/Limine bootable snapshots, chwd-style GPU
detection, and a curated "os updates" layer (keybind cheatsheet, settings
panels, system polish, on-box management skill). See README.md.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-21 11:03:10 +01:00

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monitor-hotload — hot-apply saved hyprmoncfg profiles

Follow-up to monitor-control and monitor-control-fix.

Symptom

Save a monitor profile in the Super+Ctrl+H TUI and nothing changes live: ~/.config/hypr/monitors.conf is untouched and the layout/scale stays as-is until the next login (or a monitor hotplug). A profile saved remains unapplied until systemctl --user restart hyprmoncfgd is run, which applies it instantly (best profile … score=100 → applied profile).

Cause

Two upstream behaviours compound:

  1. The TUI's plain "Save Profile" action only writes the snapshot to ~/.config/hyprmoncfg/profiles/ — applying is a separate "Save & Apply" action, which is easy to miss.
  2. hyprmoncfgd re-evaluates profiles only on startup, monitor hotplug (event or poll) and lid events (see its triggered: log lines). It does not watch the profiles directory, so a new or edited profile is invisible to it until one of those triggers happens — on a desktop with one monitor, effectively never.

Fix

A systemd user path unit closes the gap:

  • hyprmoncfgd-rescan.path — watches ~/.config/hyprmoncfg/profiles (PathChanged=, i.e. create/delete/rename/write-close inside the dir).
  • hyprmoncfgd-rescan.service — oneshot systemctl --user try-restart hyprmoncfgd (try-restart so a daemon the user deliberately stopped stays stopped).

The daemon applies the best-scoring profile on startup, so a bounce IS the rescan. Net effect: any save/edit/delete in the profiles dir is applied within a couple of seconds. The daemon never writes to the profiles dir itself, so this cannot loop.

Worth upstreaming to hyprmoncfg: the daemon could inotify-watch its own profiles dir natively.

Files

File Role
install-monitor-hotload.sh idempotent installer — installs + enables both units, pre-creates the watched dir (no sudo)
hyprmoncfgd-rescan.path watches the profiles dir
hyprmoncfgd-rescan.service oneshot daemon bounce

Packaging

  • Bake both units into the user skeleton and enable hyprmoncfgd-rescan.path alongside hyprmoncfgd (presets or skeleton symlink in default.target.wants).
  • Pre-create ~/.config/hyprmoncfg/profiles/ (empty — the no-pre-seeded- profiles rule from monitor-control still stands; an empty dir is fine and the path unit needs it to exist).

Test

  1. journalctl --user -fu hyprmoncfgd in one terminal.
  2. Super+Ctrl+H, change something (e.g. scale), plain Save Profile, quit the TUI.
  3. Within ~2s the journal shows a daemon restart → best profile … score=100 → applied profile, and the change is live; ~/.config/hypr/monitors.conf reflects it.
  4. Relogin → same layout, no error notification (the monitor-control-fix ExecStartPre gate still covers the login race).

No new keybinds; nothing to add to NoSignal-keybindings.md.

Behaviour

A file created in the profiles dir fires the path unit → the daemon bounces and re-applies the saved profile (score=100) within 2s.