Turn off backlight completely in sunlight - maemo.org

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wotevah	2010-07-30 , 03:49
Posts: 31 \| Thanked: 35 times \| Joined on Jun 2010	#1

I have noticed that in strong sunlight the N900 screen is fairly easy to read still. It's not the backlight that's stronger, I covered the light sensor to dim it and I can still read the screen just fine.

So, I am wondering if it's possible to turn off the backlight completely - preferrably on demand but perhaps also automatically when the light level is enough. This can also help save some battery because the N900 appears to be automatically boosting the backlight level to compensate for ambient light - which is nice but in strong sun it's counterproductive.

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	pycage	2010-07-30 , 09:32
	Posts: 3,404 \| Thanked: 4,474 times \| Joined on Oct 2005 @ Germany	#2

This was possible on the N810 which also had a transflexive (read: sunlight-readable) screen with an app called advanced backlight.
I think the same should be possible with the N900, too.
Maybe by echo'ing a '0' directly into the appropriate sysfs interface of the driver? Did anybody try already?

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	ossipena	2010-07-30 , 09:35
	Posts: 3,159 \| Thanked: 2,023 times \| Joined on Feb 2008 @ Finland	#3

what about making a request to there:

http://maemo.org/packages/view/simpl...htness-applet/

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nman	2010-07-30 , 16:42
Posts: 124 \| Thanked: 105 times \| Joined on Jul 2010	#4

I would love an app for customizing the backlight level. Right now I find it's too bright in total darkness... if I reduce the level then it's too dark everywhere else.

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wotevah	2010-07-31 , 01:43
Posts: 31 \| Thanked: 35 times \| Joined on Jun 2010	#5

Originally Posted by ossipena

what about making a request to there:

http://maemo.org/packages/view/simpl...htness-applet/

Good idea, I will do that.

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	lazart	2012-01-12 , 12:27
	Posts: 99 \| Thanked: 64 times \| Joined on Jun 2009 @ Stuttgart/Germany	#6

i'm also interested in turning the backlight completely off in sunlight, any news?

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Aonsaithya	2012-01-12 , 13:12
Posts: 147 \| Thanked: 150 times \| Joined on Aug 2010 @ Finland	#7

Try this in terminal:

Code:

root
echo >/sys/class/backlight/acx565akm/brightness 0

Edit:
You can make a Desktop Command Execution widget with this script (DO NOT SET IT TO RUN ON BOOT OR PERIODICALLY

Code:

echo "echo 0 > /sys/class/backlight/acx565akm/brightness" | sudo gainroot | echo ""

Last edited by Aonsaithya; 2012-01-12 at 13:19.

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	dr_frost_dk	2012-01-12 , 13:26
	Posts: 1,503 \| Thanked: 2,688 times \| Joined on Oct 2010 @ Denmark	#8

or you could install my custom brightness, just change 1 value in it and it will go to 0, with that you have total control of brightness.

link in my signature.

PS. it's post #2

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	lazart	2012-01-12 , 18:41
	Posts: 99 \| Thanked: 64 times \| Joined on Jun 2009 @ Stuttgart/Germany	#9

hi, thanks

I've never done any programming for maemo, but I'd read the light sensor value (if sun light has a greater value than bright ambient light) and set the brightness to 0 at sun light.
maybe that could help to create such a script:
http://doc.qt.nokia.com/qtmobility/s...using-a-sensor

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	dr_frost_dk	2012-01-12 , 19:46
	Posts: 1,503 \| Thanked: 2,688 times \| Joined on Oct 2010 @ Denmark	#10

Originally Posted by lazart

hi, thanks I've never done any programming for maemo, but I'd read the light sensor value (if sun light has a greater value than bright ambient light) and set the brightness to 0 at sun light.
maybe that could help to create such a script:
http://doc.qt.nokia.com/qtmobility/s...using-a-sensor

well the point of my custom brightness is no light-sensor

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