diff --git a/firmware/target/arm/rk27xx/backlight-rk27xx.c b/firmware/target/arm/rk27xx/backlight-rk27xx.c
index 06c9cc394d..065b5ef7d0 100644
--- a/firmware/target/arm/rk27xx/backlight-rk27xx.c
+++ b/firmware/target/arm/rk27xx/backlight-rk27xx.c
@@ -36,16 +36,32 @@ static int brightness = DEFAULT_BRIGHTNESS_SETTING;
  * where Yn is luminance of reference white
  *
  * Actual function is lightly tweaked to account for the fact
- * that fill factor of the PWM below ~15% gives black.
+ * that fill factor of the PWM below some value gives black.
  * So the function used to calculate the values in the matrix was:
- * f(x) = 42000 * ((100*x/31 + 16)/116)^3 + 8000
+ * f(x) = (PWM_FREQ_MAX - PWM_FREQ_MIN) * ((100*x/31 + 16)/116)^3 + PWM_FREQ_MIN
  */
+#ifdef RK27GENERIC
 static const unsigned short lin_brightness[] = {
      8110,  8191,  8304,  8455,  8649,  8892,  9189,  9545,
      9966, 10457, 11024, 11671, 12406, 13232, 14156, 15182,
     16316, 17565, 18932, 20423, 22045, 23801, 25699, 27742,
     29937, 32289, 34803, 37485, 40340, 43374, 46592, 50000
 };
+#elif defined(HM801)
+static const unsigned short lin_brightness[] = {
+    541, 542, 543, 544, 547, 549, 553, 556,
+    561, 566, 573, 580, 588, 597, 607, 618,
+    631, 644, 659, 676, 693, 713, 733, 756,
+    780, 806, 833, 862, 894, 927, 962, 1000
+};
+#elif defined(HM60X)
+static const unsigned short lin_brightness[] = {
+      3,   5,   8,  11,  16,  22,  29,  37,
+     47,  59,  72,  88, 105, 125, 147, 171,
+    198, 228, 261, 296, 335, 376, 421, 470,
+    522, 578, 638, 702, 770, 842, 918, 1000
+};
+#endif
 
 bool _backlight_init(void)
 {
@@ -61,9 +77,9 @@ bool _backlight_init(void)
     /* DIV/2, PWM reset */
     PWMT0_CTRL = (0<<9) | (1<<7);
 
-    /* set pwm frequency to 500Hz - my lcd panel can't cope more reliably */
-    /* (apb_freq/pwm_freq)/pwm_div = (50 000 000/500)/2 */
-    PWMT0_LRC = 50000; 
+    /* set pwm frequency */
+    /* (apb_freq/pwm_freq)/pwm_div = (50 000 000/pwm_freq)/2 */
+    PWMT0_LRC = lin_brightness[MAX_BRIGHTNESS_SETTING];
     PWMT0_HRC = lin_brightness[brightness];
 
     /* reset counter */