Bug 16280 – Ambient light sensor: Max value instead of 0 LUX at night

Bug 16280 - Ambient light sensor: Max value instead of 0 LUX at night

Summary:

Ambient light sensor: Max value instead of 0 LUX at night

Status:	CLOSED FIXED

Product:	SB Touch
Classification:	Unclassified
Component:	Settings
Version:	7.5.0
Platform:	All All

Importance:	P3 normal with 3 votes (vote)
Target Milestone:	7.6.0
Assigned To:	Felix Mueller

URL:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2010-06-03 00:46 UTC by cotchon
Modified:	2011-05-16 16:00 UTC (History)
CC List:	1 user (show)

See Also:
Category:	---

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Description cotchon 2010-06-03 00:46:12 UTC

Scenario: In some case, when ambient light reach 0 LUX (at night)

If you check LUX values in SB menu/factory tests you can see:
LUX: going down progressively to 0 then get Max value (16bits)

Then, at night, the screen light becomes maximum instead of minimum.

After changing some settings (gain, factor, delay, ...) the good behaviour is back, LUX detected is 0.
So I guess a SW issue.

Comment 1 cotchon 2010-06-09 23:48:36 UTC

*** This bug has been confirmed by popular vote. ***

Comment 2 cotchon 2010-06-09 23:54:53 UTC

some more details (firmware just updated, restarted):

The case it works:
  - channel 0: 0
  - channel 1: 0
  - lux: 0

The case it does not work:
  - channel 0: 0
  - channel 1: 1
  - lux: 65529

Comment 3 Markus 2010-06-10 00:15:00 UTC

I can reproduce the error as well. Very annoying!

Comment 4 Felix Mueller 2010-06-10 05:03:55 UTC

I am looking into this.

Comment 5 SVN Bot 2010-06-10 05:18:06 UTC

 == Auto-comment from SVN commit #8852 to the jive repo by fmueller ==
 == http://svn.slimdevices.com/jive?view=revision&revision=8852 ==

Bug: 16280 
Description: Fix ambient light calculation for channel0 = 0 and channel1 > 0 to report lux = 0.

Comment 6 cotchon 2010-06-11 15:54:58 UTC

I tested the feature successfully with the last FW (8852)
Bug corrected (and validated ?) on my SBTouch
Thanks ...

Comment 7 Felix Mueller 2010-06-21 09:23:04 UTC

Thanks for testing.

Comment 8 jame.saajos 2010-10-18 03:06:39 UTC

This problem still exists with the latest fw 7.5.1-r9009. When it gets completely dark in the room, the brightness starts to fluctuate.

Comment 9 cotchon 2010-10-18 08:50:33 UTC

(In reply to comment #8)
> This problem still exists with the latest fw 7.5.1-r9009. When it gets
> completely dark in the room, the brightness starts to fluctuate.

It is fixed in 7.6 branch
Regards

Comment 10 Paul Chandler 2011-05-16 16:00:13 UTC

Verified on 7.6.32419 with Touch Fw 9441

Lux goes to zero when chanel 1 and 0 are at zero