diff --git a/src/scheme/acpi.rs b/src/scheme/acpi.rs
index dec7ddf000..13c3483e17 100644
--- a/src/scheme/acpi.rs
+++ b/src/scheme/acpi.rs
@@ -256,6 +256,34 @@ impl KernelScheme for AcpiScheme {
                 // reason value.
                 Ok(*KSTOP_FLAG.lock(token.token()) as usize)
             }
+            AcpiVerb::EnterS2Idle => {
+                // Phase J: typed-AcpiVerb path. acpid calls
+                // this (via kcall_wo) instead of writing the
+                // "s2idle" string to the kstop handle. The
+                // payload is empty; the verb code is the
+                // signal. Hardware-agnostic — works on any
+                // platform with Modern Standby firmware
+                // (Dell, HP, Lenovo, LG Gram, etc.).
+                if handle != HandleBits::KSTOP_HANDLE {
+                    return Err(Error::new(EINVAL));
+                }
+                s2idle_request_set();
+                kstop_set_reason(2); // s2idle wake reason
+                Ok(0)
+            }
+            AcpiVerb::ExitS2Idle => {
+                // Phase J: s2idle wake. The kernel's mwait_loop
+                // post-handler already clears S2IDLE_REQUESTED
+                // and signals the kstop event with reason=2;
+                // this verb is provided for completeness (e.g.
+                // when acpid wants to force the wake path
+                // without going through MWAIT).
+                if handle != HandleBits::KSTOP_HANDLE {
+                    return Err(Error::new(EINVAL));
+                }
+                s2idle_signal_wake();
+                Ok(0)
+            }
         }
     }
 }
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