nix-config-ryan4yin/home/linux/gui/base/hypridle/README.md

Idle activity protection

Hypridle handles keyboard/pointer idle time, monitor power and locking. Its screen-off and lock listeners ignore application inhibitors because some applications keep them after playback stops. The hypridle-activity user service supplies an additional condition based on observed gamepad and media activity. It follows the same session target as hypridle and requires a Home Manager/system activation; editing these source files does not change the running desktop.

Activity and timing

• Gamepads are identified by udev's ID_INPUT_JOYSTICK property and read through evdev without grabbing the device. Discovery retries every five seconds, including after hotplug or permission changes. Centered analog-stick noise, synchronization and release events do not count as activity.
• Media is sampled every 15 seconds through PipeWire Pulse's output-monitor peak API and MPRIS. The pulsectl library reads peak amplitudes, not recorded audio waveforms; no audio is saved. Running, unmuted output sinks count only when their sampled peak exceeds 0.0001 (-80 dBFS), so a browser keeping a silent stream open does not prevent idling. Sampling uses up to one second per probe, rotating across outputs; the entire helper process has a two-second timeout. Only sink monitors are sampled, never microphones. Playback must reach an output exposed by PipeWire Pulse. An MPRIS player reporting Playing also counts, preserving silent-video playback protection. Brief sounds between samples or sound below the threshold can be missed; virtual outputs may be measured before the final hardware volume or mute.
• Screen-off and locking each require their configured timeout since the last observed activity, in addition to hypridle's keyboard/pointer timeout. Pausing playback or putting down the controller therefore leaves an idle grace period. Sampling and hypridle's 30-second condition retry make these approximate deadlines.

The monitor writes atomic state under $XDG_RUNTIME_DIR/hypridle-activity/ using monotonic time. Heartbeat updates remain every five seconds and do not count as activity. Gamepad events update activity immediately, independently of media sampling. Missing, malformed, future-dated or 30-second-old heartbeat data does not block idle actions. This prevents a crashed monitor from disabling automatic locking indefinitely; detection failure can consequently allow screen-off during use. Starting the monitor does not manufacture activity. The monitor prevents automatic idle actions; it does not unlock the session or power on an already blanked display when a controller is pressed.

Verification

Run the focused tests without hardware or third-party Python libraries:

python3 -m unittest discover -s home/linux/gui/base/hypridle -p 'test_*.py' -v

After activating the configuration, inspect the service and its state:

systemctl --user status hypridle-activity.service
journalctl --user -u hypridle-activity.service -n 50 --no-pager
hypridle-activity audio-peak
hypridle-activity check --timeout 1200

The check exits 1 while activity blocks the requested timeout, and 0 when allowed. Use the host's screen-off or lock timeout as appropriate. Test a connected but untouched controller, actual controller input with the game muted, playback without keyboard input, and then no input/playback. Confirm that the state timestamp stops advancing in the last case. Keep normal keyboard access available for waking the display.

If logs report permission denied for a controller, inspect its session/udev access rules. The service does not run as root and does not grant broad access to keyboard or mouse devices. An unchanging held control produces no new input events, and unusual controller layouts or drift outside the deadzone require hardware verification.