diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9bbfdde..c93a1df 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ single running list until the first versioned release.
 
 ## Unreleased
 
+- **Screen dimming:** added a **15%** idle-dim level (Off / 100 / 50 / 30 / 15).
 - **DM-1701 build support** — the Docker build is now parameterized by platform;
   `./build-firmware.sh DM1701` produces `OpenDM1701.bin` (Baofeng DM-1701 /
   Retevis RT-84). Not officially tested yet.
diff --git a/MDUV380_firmware/application/include/functions/settings.h b/MDUV380_firmware/application/include/functions/settings.h
index 4306891..b453ed3 100644
--- a/MDUV380_firmware/application/include/functions/settings.h
+++ b/MDUV380_firmware/application/include/functions/settings.h
@@ -129,7 +129,7 @@ typedef enum
 {
 	BIT_INVERSE_VIDEO               = (SETTINGS_BITS_BANK_0 | (1 << 0)),
 	BIT_PTT_LATCH                   = (SETTINGS_BITS_BANK_0 | (1 << 1)),
-	BIT_UNUSED_2                    = (SETTINGS_BITS_BANK_0 | (1 << 2)),
+	BIT_SCREEN_DIM_2                = (SETTINGS_BITS_BANK_0 | (1 << 2)), // high bit of the 3-bit screen-dim level
 	BIT_BATTERY_VOLTAGE_IN_HEADER   = (SETTINGS_BITS_BANK_0 | (1 << 3)),
 	BIT_SETTINGS_UPDATED            = (SETTINGS_BITS_BANK_0 | (1 << 4)),
 	BIT_TX_RX_FREQ_LOCK             = (SETTINGS_BITS_BANK_0 | (1 << 5)),
@@ -139,7 +139,7 @@ typedef enum
 	BIT_POWEROFF_SUSPEND            = (SETTINGS_BITS_BANK_0 | (1 << 8)),
 #endif
 	BIT_SATELLITE_MANUAL_AUTO       = (SETTINGS_BITS_BANK_0 | (1 << 9)),
-	BIT_SCREEN_DIM_0                = (SETTINGS_BITS_BANK_0 | (1 << 10)), // low bit of the 2-bit screen-dim level
+	BIT_SCREEN_DIM_0                = (SETTINGS_BITS_BANK_0 | (1 << 10)), // low bit of the 3-bit screen-dim level
 #if defined(PLATFORM_MD9600)
 	BIT_SPEAKER_CLICK_SUPPRESS      = (SETTINGS_BITS_BANK_0 | (1 << 11)),
 #endif
@@ -153,7 +153,7 @@ typedef enum
 	BIT_VISUAL_VOLUME               = (SETTINGS_BITS_BANK_0 | (1 << 18)),
 #endif
 	BIT_SECONDARY_LANGUAGE          = (SETTINGS_BITS_BANK_0 | (1 << 19)),
-	BIT_SCREEN_DIM_1                = (SETTINGS_BITS_BANK_0 | (1 << 20)), // high bit of the 2-bit screen-dim level
+	BIT_SCREEN_DIM_1                = (SETTINGS_BITS_BANK_0 | (1 << 20)), // middle bit of the 3-bit screen-dim level
 	BIT_DISPLAY_CHANNEL_DISTANCE    = (SETTINGS_BITS_BANK_0 | (1 << 21)),
 #if defined(PLATFORM_MD2017)
 	BIT_TRACKBALL_ENABLED           = (SETTINGS_BITS_BANK_0 | (1 << 22)),
@@ -420,6 +420,7 @@ typedef enum
 	SCREEN_DIM_100,      // stay at 100% of configured brightness when idle
 	SCREEN_DIM_50,       // dim to 50%
 	SCREEN_DIM_30,       // dim to 30%
+	SCREEN_DIM_15,       // dim to 15%
 	SCREEN_DIM_NUM
 } screenDimLevel_t;
 uint8_t settingsGetScreenDimLevel(void);
diff --git a/MDUV380_firmware/application/source/functions/settings.c b/MDUV380_firmware/application/source/functions/settings.c
index 498c87f..1025001 100644
--- a/MDUV380_firmware/application/source/functions/settings.c
+++ b/MDUV380_firmware/application/source/functions/settings.c
@@ -607,13 +607,14 @@ bool settingsIsOptionBitSet(bitfieldOptions_t bit)
 // no new settings field (existing codeplugs keep both bits clear = SCREEN_DIM_OFF).
 uint8_t settingsGetScreenDimLevel(void)
 {
-	return (settingsIsOptionBitSet(BIT_SCREEN_DIM_0) ? 1 : 0) | (settingsIsOptionBitSet(BIT_SCREEN_DIM_1) ? 2 : 0);
+	return (settingsIsOptionBitSet(BIT_SCREEN_DIM_0) ? 1 : 0) | (settingsIsOptionBitSet(BIT_SCREEN_DIM_1) ? 2 : 0) | (settingsIsOptionBitSet(BIT_SCREEN_DIM_2) ? 4 : 0);
 }
 
 void settingsSetScreenDimLevel(uint8_t level)
 {
 	settingsSetOptionBit(BIT_SCREEN_DIM_0, ((level & 1) != 0));
 	settingsSetOptionBit(BIT_SCREEN_DIM_1, ((level & 2) != 0));
+	settingsSetOptionBit(BIT_SCREEN_DIM_2, ((level & 4) != 0));
 }
 
 void settingsSetDirty(void)
diff --git a/MDUV380_firmware/application/source/io/display.c b/MDUV380_firmware/application/source/io/display.c
index 9121174..d926046 100644
--- a/MDUV380_firmware/application/source/io/display.c
+++ b/MDUV380_firmware/application/source/io/display.c
@@ -467,7 +467,7 @@ int displayGetIdleBacklightPercentage(void)
 {
 	if (nonVolatileSettings.backlightMode == BACKLIGHT_MODE_AUTO)
 	{
-		static const uint8_t dimPercent[SCREEN_DIM_NUM] = { 0, 100, 50, 30 };
+		static const uint8_t dimPercent[SCREEN_DIM_NUM] = { 0, 100, 50, 30, 15 };
 		uint8_t level = settingsGetScreenDimLevel();
 
 		if (level != SCREEN_DIM_OFF)
diff --git a/MDUV380_firmware/application/source/user_interface/menuDisplayOptions.c b/MDUV380_firmware/application/source/user_interface/menuDisplayOptions.c
index d9d5c64..d082656 100644
--- a/MDUV380_firmware/application/source/user_interface/menuDisplayOptions.c
+++ b/MDUV380_firmware/application/source/user_interface/menuDisplayOptions.c
@@ -249,7 +249,7 @@ static void updateScreen(bool isFirstRun)
 
 				case DISPLAY_SCREEN_DIM:
 					{
-						const char *dimOpts[] = { currentLanguage->off, "100%", "50%", "30%" };
+						const char *dimOpts[] = { currentLanguage->off, "100%", "50%", "30%", "15%" };
 						leftSide = "Screen Dim";
 						rightSideConst = dimOpts[settingsGetScreenDimLevel()];
 					}