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Add screen idle timeout and power button screen toggle

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New Python screen monitor uses Allwinner /dev/disp ioctls to turn off
the display after 15s of no input and toggle it with a short power
button press. Launched by the wrapper alongside sdlamp2.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Michael Smith
2026-02-13 21:34:43 +01:00
parent 06daec791e
commit 2142ed7629
4 changed files with 173 additions and 3 deletions
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docs/sdlamp2-fsd.md
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@@ -43,6 +43,13 @@ This document specifies the functional requirements for an SDL2 based media play
## 6. Changelog
### 2026-02-13 — Screen idle timeout and power button toggle
- **Screen idle timeout**: New Python screen monitor (`rg35xx-screen-monitor.py`) turns off the display after 15 seconds of no input on any device. Audio continues playing. Any button press wakes the screen.
- **Power button screen toggle**: A short press (<2s) of the power button toggles the screen on/off. Long press (3s+) still triggers shutdown via the existing wrapper logic.
- **Allwinner /dev/disp backlight**: Uses `SET_BRIGHTNESS` / `GET_BRIGHTNESS` ioctls on `/dev/disp` since the device has no sysfs backlight interface. Brightness is restored on SIGTERM so the shutdown screen remains visible.
- **Wrapper integration**: `rg35xx-wrapper.sh` launches the screen monitor alongside sdlamp2 and kills it during cleanup.
### 2026-02-13 — Hold-to-shutdown with stock shutdown screen
- **Hold-to-shutdown**: The power button monitor in `rg35xx-wrapper.sh` requires a 3-second hold before triggering shutdown. A quick tap does nothing — a background timer subshell starts on press and is cancelled on release. If held past 3 seconds, sends SIGTERM to sdlamp2 then triggers shutdown.