diff --git a/src/board/system76/common/kbscan.c b/src/board/system76/common/kbscan.c
index 59045a3..4bf8ff4 100644
--- a/src/board/system76/common/kbscan.c
+++ b/src/board/system76/common/kbscan.c
@@ -221,26 +221,32 @@ bool kbscan_press(uint16_t key, bool pressed, uint8_t * layer) {
             break;
         case (KT_SCI):
             if (pressed) {
-                uint8_t sci = (uint8_t)(key & 0xFF);
-
-                if (!pmc_sci(&PMC_1, sci)) {
-                    // In the case of ignored SCI, reset bit
-                    return false;
+                // Send SCI if ACPI OS is loaded
+                if (acpi_ecos != EC_OS_NONE) {
+                    uint8_t sci = (uint8_t)(key & 0xFF);
+                    if (!pmc_sci(&PMC_1, sci)) {
+                        // In the case of ignored SCI, reset bit
+                        return false;
+                    }
                 }
 
+                // Handle hardware hotkeys
                 hardware_hotkey(key);
             }
             break;
         case (KT_SCI_EXTRA):
             if (pressed) {
-                uint8_t sci = SCI_EXTRA;
-                sci_extra = (uint8_t)(key & 0xFF);
-
-                if (!pmc_sci(&PMC_1, sci)) {
-                    // In the case of ignored SCI, reset bit
-                    return false;
+                // Send SCI if ACPI OS is loaded
+                if (acpi_ecos != EC_OS_NONE) {
+                    uint8_t sci = SCI_EXTRA;
+                    sci_extra = (uint8_t)(key & 0xFF);
+                    if (!pmc_sci(&PMC_1, sci)) {
+                        // In the case of ignored SCI, reset bit
+                        return false;
+                    }
                 }
 
+                // Handle hardware hotkeys
                 hardware_hotkey(key);
             }
             break;
diff --git a/src/board/system76/common/lid.c b/src/board/system76/common/lid.c
index 6c7d08d..d2c2383 100644
--- a/src/board/system76/common/lid.c
+++ b/src/board/system76/common/lid.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
 #include <arch/delay.h>
+#include <board/acpi.h>
 #include <board/gpio.h>
 #include <board/lid.h>
 #include <board/pmc.h>
@@ -33,15 +34,17 @@ void lid_event(void) {
             DEBUG("closed\n");
         }
 
-        // Send SCI
+        // Send SCI if ACPI OS is loaded
         send_sci = true;
     }
     lid_state = new;
 
     if (send_sci) {
-        // Send SCI 0x1B for lid event
-        if (pmc_sci(&PMC_1, 0x1B)) {
-            send_sci = false;
+        // Send SCI 0x1B for lid event if ACPI OS is loaded
+        if (acpi_ecos != EC_OS_NONE) {
+            if (pmc_sci(&PMC_1, 0x1B)) {
+                send_sci = false;
+            }
         }
     }
 }
diff --git a/src/board/system76/common/power.c b/src/board/system76/common/power.c
index 4105531..7a455c7 100644
--- a/src/board/system76/common/power.c
+++ b/src/board/system76/common/power.c
@@ -370,9 +370,11 @@ void power_event(void) {
         ac_send_sci = true;
     }
     if (ac_send_sci) {
-        // Send SCI 0x16 for AC detect event
-        if (pmc_sci(&PMC_1, 0x16)) {
-            ac_send_sci = false;
+        // Send SCI 0x16 for AC detect event if ACPI OS is loaded
+        if (acpi_ecos != EC_OS_NONE) {
+            if (pmc_sci(&PMC_1, 0x16)) {
+                ac_send_sci = false;
+            }
         }
     }
     ac_last = ac_new;