I don't have a toggle for automatic brightness in my phone's settings menu and I cannot install apps like Lux Auto Brightness that depend on the light sensor. I can, however, turn automatic brightness on using Widgetsoid and it works fine. Why do all the apps think I don't have a light sensor and how can I fix this?

Since I have installed Cyanogenmod, I can now install Lux. However it always sees a brightness of -1 Lux.

  • Could you write what device you have?
    – Tschareck
    Apr 15, 2012 at 17:52
  • Sony Ericsson Xperia Neo V.
    – Nova
    Apr 15, 2012 at 18:12

1 Answer 1


I also had this problem with Lux, always light reported -1, which I don't know it's a problem either from phone, sensor, Android, or Lux itself! BTW, I solved it by using front camera instead of light sensor. here is how:

  • go to Lux settings
  • click on Sample Collection
  • click on Light reading modes
  • select Camera instead of Light sensor
  • select Front camera (it's obvious that its better than rear camera for this purpose)
  • Now, from main screen of settings, click on Modify Linked Samples
  • from top, click on Luma (this app uses Lux for sensor readings and Luma for camera readings)
  • then you can see app reads ambient light value from camera and displays at top.
  • Now the app should do its job, but you may want to check other settings to match your preferences.

good luck

  • 2
    I figured that the app would work with the camera but this is only supported by the paid version.
    – Nova
    Sep 6, 2012 at 15:22

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