Fix power button screen toggle instantly turning back on

Power button events were setting any_activity before the power handler's
continue, causing the generic wake logic to immediately re-enable the screen.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/sdlamp2-fsd.md

@@ -43,6 +43,10 @@ This document specifies the functional requirements for an SDL2 based media play
 
 ## 6. Changelog
 
+### 2026-02-13 — Fix power button screen toggle regression
+
+- **Power button screen off stays off**: Fixed regression from fbd32d7 where short-pressing the power button to turn off the screen would instantly turn it back on. The generic wake logic (`any_activity`) was being triggered by power button events themselves. Moved `any_activity = True` below the power button handler's `continue` so power events are handled exclusively by the power button handler and don't trigger the wake path.
+
 ### 2026-02-13 — Screen wake fixes and idle auto-shutdown
 
 - **D-pad wakes screen**: The screen monitor now wakes on any input event type (EV_ABS, EV_KEY, etc.), not just EV_KEY. This fixes d-pad presses (which generate EV_ABS hat events) not waking the screen.

tools/rg35xx-screen-monitor.py

@@ -198,8 +198,6 @@ def main():
                 if ev_type == EV_SYN:
                     continue
 
-                any_activity = True
-
                 # Power button handling (EV_KEY only)
                 if ev_type == EV_KEY and ev_code == KEY_POWER:
                     if ev_value == 1:  # press
@@ -220,6 +218,8 @@ def main():
                         # Between SHORT and LONG threshold: ignore (release before 3s)
                     continue
 
+                any_activity = True
+
         # Any input activity resets idle shutdown timer
         if any_activity:
             last_active_time = time.monotonic()