more teardown on deep sleep (Mirror #2060)

lib/hal/HalPowerManager.cpp

@@ -64,6 +64,14 @@ void HalPowerManager::setPowerSaving(bool enabled) {
 void HalPowerManager::startDeepSleep(HalGPIO& gpio, bool keepClockAlive) const {
   LOG_DBG("PWR", "startDeepSleep: isPressed=%d, rawPin=%d, keepClock=%d", gpio.isPressed(HalGPIO::BTN_POWER),
           digitalRead(InputManager::POWER_BUTTON_PIN) == LOW, keepClockAlive);
+
+#ifdef ENABLE_SERIAL_LOG
+  // Tear down HWCDC so the host sees a clean disconnect and the peripheral
+  // doesn't hold power domains that interfere with USB-powered GPIO wake.
+  // logSerial is the raw HWCDC reference; Serial is the MySerialImpl proxy
+  // (which doesn't expose end()).
+  logSerial.end();
+#endif
   // Perform all hardware preparation immediately (while the button may still be held)
   // so the user gets instant visual feedback (display already off). Only block for
   // button release at the very end, right before entering sleep.
@@ -96,7 +104,6 @@ void HalPowerManager::startDeepSleep(HalGPIO& gpio, bool keepClockAlive) const {
   // regardless of the wakeup source configuration.
   // When keepClockAlive is true, this is the actual wakeup mechanism since the MCU stays powered.
   esp_deep_sleep_enable_gpio_wakeup(1ULL << InputManager::POWER_BUTTON_PIN, ESP_GPIO_WAKEUP_GPIO_LOW);
-  LOG_DBG("PWR", "startDeepSleep: entering deep sleep now");
   // Enter Deep Sleep
   esp_deep_sleep_start();
 }