High power consumption on auto-brightness

[mtb-defy]

Hi!

I recently installed PowerTutor on CM7 nightly from yesterday. An app to display the power consumption in mA. Now I recognized some strange behaviour.
First I measured the power consumption with display on highest power. ->700mA
Second I measred with lowest power. -> 350mA
then I switched on auto-brightness. -> 350mA
When I switch on auto-brightness after having the display on highest power it uses 700mA.
Can anybody confirm this?

Thanks for your answers!

 

[adyrafy]

I'we noticed it too
After a clean install i always set the brightness level to lowest value and then activate auto brightness and it is ok.
I did this even on a samsung Galaxy s - Custom ROM 2.3.3 and it keeps batery from quickly draining.

 

[mtb-defy]

I'll try it out on an original Defy and post results here. If it's a CM7 bug, I'm gonna post it on github.
Anybody else having noticed this?

 

[adyluk]

Hi, i noticed this also after installing the cm7.1.
I found this issue from the battery usage info. On previous versions the highest consumption was from the cell stdby and idle phone, and in this version about 80% os the display

 

[bvbfan]

Exactly the same values, any solutions... Display eat so much more power compare to stock 2.2, but why... I want to try some tips about to decrease display consumption

 

[gkai]

I have reproduced the problem...but I think it is due to the way power tutor misestimates LCD power draw, not an actual of LCD power usage. See post http://forum.xda-developers.com/showpost.php?p=17674701&postcount=11806

and the few posts above...

 

[Zephyrot]

I have reproduced the problem...but I think it is due to the way power tutor misestimates LCD power draw, not an actual of LCD power usage. See post http://forum.xda-developers.com/showpost.php?p=17674701&postcount=11806

and the few posts above...

This

The Defy doesnt have any reporting measurement in the Battery driver, this means we cant see how many mA are actually being consumed.

Doesnt matter if it is Froyo, Cm7 or MIUI, the Driver just doesnt provide the info to the OS. All we can use are Voltage readings and estimations.