diff --git a/src/board/system76/galp3-c/acpi.c b/src/board/system76/galp3-c/acpi.c
index 299878c..b8df06d 100644
--- a/src/board/system76/galp3-c/acpi.c
+++ b/src/board/system76/galp3-c/acpi.c
@@ -7,6 +7,8 @@
 
 extern bool lid_wake;
 
+extern uint8_t sci_extra;
+
 uint8_t fcmd = 0;
 uint8_t fdat = 0;
 uint8_t fbuf[4] = { 0, 0, 0, 0 };
@@ -80,6 +82,8 @@ uint8_t acpi_read(uint8_t addr) {
         ACPI_16(0x2E, battery_remaining_capacity);
         ACPI_16(0x32, battery_voltage);
 
+        ACPI_8(0xCC, sci_extra);
+
         // Airplane mode LED
         case 0xD9:
             if (!gpio_get(&LED_AIRPLANE_N)) {
diff --git a/src/board/system76/galp3-c/include/board/keymap.h b/src/board/system76/galp3-c/include/board/keymap.h
index e24dce1..3bd63e4 100644
--- a/src/board/system76/galp3-c/include/board/keymap.h
+++ b/src/board/system76/galp3-c/include/board/keymap.h
@@ -3,6 +3,12 @@
 
 #include <common/keymap.h>
 
+// Extra SCI layer for keyboard backlight control
+#define KT_SCI_EXTRA (0x4000)
+
+#define SCI_EXTRA (0x50)
+#define SCI_EXTRA_KBD_BKL (0x8A)
+
 #define ___ 0
 
 // Conversion of physical layout to keyboard matrix
diff --git a/src/board/system76/galp3-c/kbscan.c b/src/board/system76/galp3-c/kbscan.c
index 48892fc..2ff0a99 100644
--- a/src/board/system76/galp3-c/kbscan.c
+++ b/src/board/system76/galp3-c/kbscan.c
@@ -10,6 +10,8 @@
 
 bool kbscan_enabled = false;
 
+uint8_t sci_extra = 0;
+
 void kbscan_init(void) {
     KSOCTRL = 0x05;
     KSICTRLR = 0x04;
@@ -98,6 +100,15 @@ void kbscan_event(void) {
                             if (new_b) layer = 1;
                             else layer = 0;
                             break;
+                        case (KT_SCI_EXTRA):
+                            if (new_b) {
+                                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
+                                    new &= ~(1 << j);
+                                }
+                            }
                         case (KT_SCI):
                             if (new_b) {
                                 uint8_t sci = (uint8_t)(key & 0xFF);
diff --git a/src/board/system76/galp3-c/keymap/default.c b/src/board/system76/galp3-c/keymap/default.c
index d7c48fa..9c7da5b 100644
--- a/src/board/system76/galp3-c/keymap/default.c
+++ b/src/board/system76/galp3-c/keymap/default.c
@@ -12,7 +12,7 @@ LAYOUT(
     K_LEFT_CTRL, KT_FN, K_LEFT_SUPER, K_LEFT_ALT, K_SPACE, K_RIGHT_ALT, K_APP, K_RIGHT_CTRL, K_LEFT, K_DOWN, K_RIGHT
 ),
 LAYOUT(
-    K_ESC, K_TOUCHPAD, K_F2, K_MUTE, K_F4, K_VOLUME_DOWN, K_VOLUME_UP, K_F7, KT_SCI | SCI_BRIGHTNESS_DOWN, KT_SCI | SCI_BRIGHTNESS_UP, K_F10, KT_SCI | SCI_AIRPLANE_MODE, KT_SCI | SCI_SUSPEND, 0 /*prtsc*/, 0 /*pause*/, K_INSERT, K_DEL,
+    K_ESC, K_TOUCHPAD, K_F2, K_MUTE, KT_SCI_EXTRA | SCI_EXTRA_KBD_BKL, K_VOLUME_DOWN, K_VOLUME_UP, K_F7, KT_SCI | SCI_BRIGHTNESS_DOWN, KT_SCI | SCI_BRIGHTNESS_UP, K_F10, KT_SCI | SCI_AIRPLANE_MODE, KT_SCI | SCI_SUSPEND, 0 /*prtsc*/, 0 /*pause*/, K_INSERT, K_DEL,
     K_PLAY_PAUSE, K_1, K_2, K_3, K_4, K_5, K_6, K_7, K_8, K_9, K_0, K_MINUS, K_EQUALS, K_BKSP, K_HOME,
     K_TAB, K_Q, K_W, K_E, K_R, K_T, K_Y, K_U, K_I, K_O, K_P, K_BRACE_OPEN, K_BRACE_CLOSE, K_BACKSLASH, K_PGUP,
     K_CAPS, K_A, K_S, K_D, K_F, K_G, K_H, K_J, K_K, K_L, K_SEMICOLON, K_QUOTE, K_ENTER, K_PGDN,
diff --git a/src/board/system76/galp3-c/keymap/jeremy.c b/src/board/system76/galp3-c/keymap/jeremy.c
index 8401fb0..bbc6618 100644
--- a/src/board/system76/galp3-c/keymap/jeremy.c
+++ b/src/board/system76/galp3-c/keymap/jeremy.c
@@ -12,7 +12,7 @@ LAYOUT(
     K_LEFT_CTRL, KT_FN, K_LEFT_ALT, K_LEFT_SUPER, K_SPACE, KT_FN, K_RIGHT_ALT, K_RIGHT_CTRL, K_LEFT, K_DOWN, K_RIGHT
 ),
 LAYOUT(
-    K_ESC, K_TOUCHPAD, K_F2, K_MUTE, K_F4, K_VOLUME_DOWN, K_VOLUME_UP, K_F7, KT_SCI | SCI_BRIGHTNESS_DOWN, KT_SCI | SCI_BRIGHTNESS_UP, K_F10, KT_SCI | SCI_AIRPLANE_MODE, KT_SCI | SCI_SUSPEND, 0 /*prtsc*/, 0 /*pause*/, K_INSERT, K_DEL,
+    K_ESC, K_TOUCHPAD, K_F2, K_MUTE, KT_SCI_EXTRA | SCI_EXTRA_KBD_BKL, K_VOLUME_DOWN, K_VOLUME_UP, K_F7, KT_SCI | SCI_BRIGHTNESS_DOWN, KT_SCI | SCI_BRIGHTNESS_UP, K_F10, KT_SCI | SCI_AIRPLANE_MODE, KT_SCI | SCI_SUSPEND, 0 /*prtsc*/, 0 /*pause*/, K_INSERT, K_DEL,
     K_PLAY_PAUSE, K_1, K_2, K_3, K_4, K_5, K_6, K_7, K_8, K_9, K_0, K_MINUS, K_EQUALS, K_BKSP, K_HOME,
     K_TAB, K_Q, K_W, K_E, K_R, K_T, K_Y, K_PGUP, K_HOME, K_PGDN, K_P, K_BRACE_OPEN, K_BRACE_CLOSE, K_BACKSLASH, K_PGUP,
     KT_FN, K_A, K_S, K_D, K_F, K_G, K_LEFT, K_DOWN, K_UP, K_RIGHT, K_BKSP, K_DEL, K_ENTER, K_PGDN,