I have Sony Xperia Z (C6603, 10.7.A.0.222) and the brightness level is stuck at minimum after update to 5.1.1.

I have tried:

  • sensor test - light sensor is OK.
  • set brightness via ADB (settings put system screen_brightness 200) - didn't work.
  • using brightness control apps (like LUX for example) - didn't work.

Using stock ROM without root, any apps or functions that could set brightness to low for saving battery are either uninstalled or turned off? Any suggestions?

  • This is probably one of the oddest problems I've seen here. Have you tried a factory reset? Not really ideal, but worth a shot. – Ethan Z Jan 5 '16 at 1:13
  • Tried it, my thoughts are it must be either hardware problem or this ROM problem.. Any suggestions? – Marcus Jan 5 '16 at 1:28
  • you can flash the rom but chances are that there is hardware damage. – Ethan Z Jan 5 '16 at 1:29

This happened to me on my galaxy note20 3 weeks ago. My screen went pretty dark. After a hour or so i saw on settings blue light filter was on. I did not turn it on. I had to shut it off then reset the phone.

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