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Document immediate brightness architecture

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jan
2026-04-25 19:11:19 +02:00
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README.md
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@@ -6,6 +6,21 @@ The internal display is the master. Brightness keys change the internal panel, s
This avoids drift from letting two outputs auto-adjust independently.
## Architecture
The real brightness change is intentionally immediate:
```text
brightness-up/down-all
-> brightnessctl immediately changes the internal display
-> brightness-osd only displays or updates the visual feedback
-> external-brightness-sync.service mirrors the internal percentage later
```
The actual `brightnessctl` call must not be debounced. Only the OSD may be smoothed by reusing the running OSD process and extending its hide timer.
The external monitor is not changed in the key-binding scripts. `ddcutil` is slower than an internal backlight write, so it runs separately in the sync service.
## Features
- Internal display controlled with `brightnessctl`
@@ -82,6 +97,7 @@ Default config:
```bash
BRIGHTNESS_BACKLIGHT_DEVICE="intel_backlight"
BRIGHTNESS_SYNC_BACKLIGHT="/sys/class/backlight/intel_backlight"
BRIGHTNESS_OSD_BACKLIGHT="/sys/class/backlight/intel_backlight"
BRIGHTNESS_STEP="10"
BRIGHTNESS_DDCUTIL_MODEL="HG342PCB"
BRIGHTNESS_DDCUTIL_DISPLAY="1"