I think i should re-title this bug because brightness works but it does
not adapt properly.

For my understanding the real bug is the brightness will only adapt if
there is a difference between two readings within 4.5 sec when it is
turned on. So in very dark conditions when your phone is turned on there
in no variation in brightness and the phone stays at the original
brightness that when you turned it off (see comment #14) which could be
really bright.

To easily reproduce this bug follow this steps.

>Turn off auto brightness.
>Put manually the brightness to maximum
>Cover the proximity sensor with your finger
>turn on auto brightness

==> expected the brightness to be corrected from maximum to minimum

Bug => As long as you keep your finger on the sensor the brightness is kept to 
maximum.
As soon as you remove your finger from the sensor and approach it from a light 
source, count 4.5 sec and you will see the brightness changing cover the sensor 
again and 4.5 sec later it will be at minimum brightness where it should have 
been.


In user case. In a dark room when you turn on your phone the brightness will 
never change (That's the reason i thought the brightness was broken)


** Summary changed:

- Regression: Rc-proposed Nexus 4 autobrightness does not work
+ Regression: In dark conditions autobrightness does not adapt

** Description changed:

  OS ubuntu 15.04
  since bq-aquaris.en/mako r.380 autobrightness does not work anymore
+ See comment #17 for a better description of the bug

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https://bugs.launchpad.net/bugs/1613871

Title:
  Regression: In dark conditions autobrightness does not adapt

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