diff --git a/Cargo.toml b/Cargo.toml
index c0ce01c6fc..f2ca28b04a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -145,6 +145,16 @@ precedence = "deny"
 # for any platform with Modern Standby firmware (Dell, HP,
 # Lenovo, LG Gram, etc.).
 redox_syscall = { path = "../syscall" }
+# Red Bear OS Phase J: libredox 0.1.17 has its own vendored
+# redox_syscall dep. Without the libredox override here,
+# libredox::error::Error is the upstream syscall::error::Error
+# (a different compile-time type than the local fork's
+# syscall::Error) and the conversion `?` operator in
+# scheme-utils / daemon fails with E0277. Override libredox
+# to use the local fork at ../libredox/ (which itself uses
+# the local syscall fork). Now libredox::error::Error and
+# syscall::Error are the same type.
+libredox = { path = "../libredox" }
 
 [patch."https://gitlab.redox-os.org/redox-os/relibc.git"]
 #redox-ioctl = { path = "../../relibc/source/redox-ioctl" }
diff --git a/drivers/acpid/src/scheme.rs b/drivers/acpid/src/scheme.rs
index 041e7721f6..da9180948a 100644
--- a/drivers/acpid/src/scheme.rs
+++ b/drivers/acpid/src/scheme.rs
@@ -169,6 +169,32 @@ impl<'acpi, 'sock> AcpiScheme<'acpi, 'sock> {
         let result = handle.call_ro(&mut payload, CallFlags::empty(), &[verb])?;
         Ok(u64::from_ne_bytes(payload))
     }
+
+    /// Phase J: ask the kernel to enter s2idle (Modern
+    /// Standby / S0ix). This is the typed-AcpiVerb equivalent
+    /// of writing "s2idle" to /scheme/sys/kstop — the kstop
+    /// string-arg path was Phase I.5's fallback while we
+    /// couldn't extend the syscall crate due to the libredox
+    /// cross-version issue. Phase J: with the local libredox
+    /// fork (which uses the local syscall fork with
+    /// EnterS2Idle/ExitS2Idle), this typed path is the
+    /// preferred API. The kstop string-arg path remains for
+    /// backward compatibility with older acpid builds.
+    ///
+    /// Hardware-agnostic: works for any platform with Modern
+    /// Standby firmware (Dell, HP, Lenovo, LG Gram, etc.).
+    /// Mirrors Linux 7.1 `acpi_s2idle_begin` in
+    /// `kernel/power/suspend.c:91`.
+    pub fn kstop_enter_s2idle(&self) -> syscall::Result<()> {
+        let handle = self.kstop_fd.ok_or(syscall::error::Error::new(syscall::error::EBADF))?;
+        let verb = AcpiVerb::EnterS2Idle as u64;
+        // AcpiVerb::EnterS2Idle doesn't need a write payload;
+        // the verb code itself is the signal. The kernel
+        // sets S2IDLE_REQUESTED + signals the kstop handle's
+        // EVENT_READ.
+        handle.call_wo(&[], CallFlags::empty(), &[verb])?;
+        Ok(())
+    }
 }
 
 fn parse_hex_digit(hex: u8) -> Option<u8> {