Backlight remains when locking the display

[GoogleCodeExporter]

Build Affected: cm-7-20120919-UNOFFICIAL-kovsky
Google Apps: gapps-gb-20110828-signed
Type: System
Priority: Major
Description: The backlight will remain when locking the display. It seems 
brighter than when fully turned off. This will drain battery life faster.
Recreation: Lock screen. Compare backlight with another Sony Ericsson XPERIA X1 
(turned off or while display is off).
Notes:

Original issue reported on code.google.com by BrianXP7 on 22 Sep 2012 at 4:21

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[deleted comment]

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I am 100% certain that this isn't a problem on my phone. I took it to a 
completely dark room, and there is no light coming from it.

On the other hand you may be on to something. If there is a real difference 
between a Winmo phone and ours it may be because the lcd controller hasn't been 
turned off in suspend. If it hasn't it may draw more power than it should. This 
needs to be investigated further.

Original comment by tor...@gmail.com on 23 Sep 2012 at 8:01

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I looked everywhere in the settings and there's nothing to control it. (I 
didn't install any third-party apps.) I left it for 30 seconds to lock 
automatically, and the backlight still remains. My XPERIA has that 
keyboard/display issue, so I can compare the display when locked and when the 
display is fully off (When the hardware keyboard is slid out).

Original comment by BrianXP7 on 23 Sep 2012 at 9:06

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The lcd controller is controlled by the kernel, so someone will have to read 
through the code and check if everything is done correctly there.

When I turn on my phone I can clearly see that the backlight turns on first, 
and then the lockscreen appears. Do you notice that?

What kind of battery life are you getting. It should be about 30 hours

Original comment by tor...@gmail.com on 24 Sep 2012 at 7:14

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I'm getting around 15-25 hours of battery life. And the backlight just stays 
there. Is it probably because I disabled the Screen-Off and Screen-On 
animations?

Original comment by BrianXP7 on 24 Sep 2012 at 8:06

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Quote: (From CoolRunnerII via XDA-Developers)

I have seen that too, I think it is because suspend is blocked because a bunch 
of background processes need to complete before it can suspend all the way. 
After a while everything is done and it goes all the way down to power collapse 
(lowest power save mode).

Original comment by BrianXP7 on 30 Sep 2012 at 5:10

• Changed state: Confirmed

[GoogleCodeExporter]

With auto brightness this issue seems to be resolved.

Original comment by tor...@gmail.com on 10 Feb 2013 at 8:11

• Changed state: Fixed