Why does the Smart backlight control not work?

Question

• Why does the Smart backlight control not work?

Valid for

• Xperia XZ2, Xperia XZ2 Compact, Xperia XZ2 Premium and Xperia XZ3 (running Android 9.0 Pie software which is 52.0.A.3.163 or older) 
• Xperia XZ1, Xperia XZ1 Compact, Xperia XZ Premium (running Android 9.0 Pie software which is 47.2.A.4.45 or older)

Solution

You might experience that the Smart backlight control does not work or keeps stopping. This is a known issue that will be corrected in a new software release.