Xperia M2 Dual Auto Brightness not working after update to 4.4.4

[HiruR]

Hi, i just bought xperia m2 dual a days ago and then i update the system. After updating to 4.4.4, the auto brightness doesn't work. Before updating the system, the auto brightness seems to work, that is at android 4.3. Is there any solution to this? Thank You

[Uliwooly]

Check the proximity sensor

[dev123]

Check the Ambient light sensor, By performing Sony service test. Dial *#*#7378423#*#*

[HiruR]

The proximity sensor  and the ambient light sensor is working when i tested it using service test. The proximity sensor detect my hand when i put it on it. The ambient light sensor also giving different value when i put it at different lighting. But the auto brightness still not work.

[Uliwooly · Accepted solution]

It'll be wise to reinstall the latest update with 

PC Companion (PCC)

Bridge (for Mac)

Alternatives on How to backup Xperias

http://talk.sonymobile.com/thread/36355

[HiruR]

Wow it works, thanks

[Uliwooly]

Anytime