fix: fix login screen hang when no USB input device plugged in

kernel/src/Timekeeping/ApicTimer.hpp

@@ -28,15 +28,11 @@ namespace Timekeeping {
     // Enable scheduler tick (called after scheduler is initialized)
     void EnableSchedulerTick();
 
-    // Enter one idle wait cycle for the current CPU. The BSP uses a
-    // one-shot LAPIC timer while idle; APs keep their existing simple wait.
+    // Enter one idle wait cycle for the current CPU. Uses HLT and relies on
+    // the boot-time periodic LAPIC timer to wake -- one-shot wake doesn't
+    // survive deep C-states on some laptop CPUs.
     void IdleOnce(bool hasMwait, volatile uint64_t* monitorAddr = nullptr);
 
-    // Mark recent latency-sensitive input activity. Idle policy uses this to
-    // stay in shallow, high-responsiveness mode briefly while the user is
-    // moving the pointer or dragging windows.
-    void NoteInteractiveActivity(uint32_t durationMs = 250);
-
     // Busy-wait sleep for the given number of milliseconds
     void Sleep(uint64_t ms);
 };