2 files changed, 12 insertions, 0 deletions

diff --git a/firmware/export/config-h300.h b/firmware/export/config-h300.h
index 748635dcb4..14034c61f0 100644
--- a/firmware/export/config-h300.h
+++ b/firmware/export/config-h300.h
@@ -156,6 +156,12 @@
 #define MAX_CONTRAST_SETTING        63
 #define DEFAULT_CONTRAST_SETTING    40
 
+/* Main LCD backlight brightness range and defaults */
+/* accepts 0..15 but note that 0 and 1 give a black display on H300! */
+#define MIN_BRIGHTNESS_SETTING      2  /*  2/16 (12.50%) */
+#define MAX_BRIGHTNESS_SETTING      15 /* 15/16 (93.75%) */
+#define DEFAULT_BRIGHTNESS_SETTING  9  /*  9/16 (56.25%) */
+
 /* Remote LCD contrast range and defaults */
 #define MIN_REMOTE_CONTRAST_SETTING     MIN_CONTRAST_SETTING
 #define MAX_REMOTE_CONTRAST_SETTING     MAX_CONTRAST_SETTING
diff --git a/firmware/export/config-iaudiox5.h b/firmware/export/config-iaudiox5.h
index ddcac0e8ee..d45f58f14c 100644
--- a/firmware/export/config-iaudiox5.h
+++ b/firmware/export/config-iaudiox5.h
@@ -72,6 +72,12 @@
 #define MAX_REMOTE_CONTRAST_SETTING     35
 #define DEFAULT_REMOTE_CONTRAST_SETTING 24 /* Match boot contrast */
 
+/* Main LCD backlight brightness range and defaults */
+/* PCF50506 can output 0%-100% duty cycle but D305A expects %15-100%. */
+#define MIN_BRIGHTNESS_SETTING      1  /* 15/16 (93.75%) */
+#define MAX_BRIGHTNESS_SETTING      13 /*  3/16 (18.75%) */
+#define DEFAULT_BRIGHTNESS_SETTING  8  /*  8/16 (50.00%) = x5 boot default */
+
 /* Define this for LCD backlight available */
 #define CONFIG_BACKLIGHT BL_X5 /* PCF50606 I2C */
 #define HAVE_BACKLIGHT_BRIGHTNESS