diff --git a/components/axp192/axp192.cpp b/components/axp192/axp192.cpp
index 39ad722..bdd2d11 100644
--- a/components/axp192/axp192.cpp
+++ b/components/axp192/axp192.cpp
@@ -207,7 +207,7 @@ void AXP192Component::UpdateBrightness()
       case AXP192_M5CORE2:
       {
         uint8_t buf = Read8bit( 0x27 );
-        Write1Byte( 0x27 , ((buf & 0x0f) | (ubri << 4)) );
+		Write1Byte( 0x27 , ((buf & 0x80) | (ubri << 3)) );
       }
     }
 }
diff --git a/sample-config/m5core2.yaml b/sample-config/m5core2.yaml
index 67f0694..8a3c9f8 100644
--- a/sample-config/m5core2.yaml
+++ b/sample-config/m5core2.yaml
@@ -39,6 +39,7 @@ sensor:
     address: 0x34
     i2c_id: bus_a
     update_interval: 30s
+	brightness: 75%
     battery_level:
       name: "${upper_devicename} Battery Level"
       id: "${devicename}_batterylevel"
@@ -72,4 +73,4 @@ display:
     cs_pin: 5
     dc_pin: 15
     lambda: |-
-      it.line(20, 20, 200, 200);
\ No newline at end of file
+      it.line(20, 20, 200, 200);