backlight off when brightness under a certain level

Discussions about Linux installation and configuration on Samsung laptops
dawez
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backlight off when brightness under a certain level

Postby dawez » 29/04/2013, 10:41

Hi all,

I have one issue on my Samsung Q310 using the voria tools, when I start the system using the battery the screen is off and I need to increase the brightness via the function key and the press fn+f5.

When I start the system with the AC power supply connected all is working good and the screen is in a visible state.

I guess that the issue is connected a problem appearing when reducing the brightness: I checked the file /sys/class/backlight/samsung/actual_brightness and it can go from 0 up to 8. When anyway I decrease the brightness under the 3 level, the screen backlight switches off completely and I cannot switch on again by increasing the brightness level. So the backlight is off even is the " actual_brightness" is more than 3.

1) is there a way to setup the initial brightness level when starting using the battery ?

2) Is there a way to set the minimum level to 3 instead of 0 ? This way I guess should fix all the issues.

Thx in advance.

dawez
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Joined: 08/09/2011, 11:22

Re: backlight off when brightness under a certain level

Postby dawez » 29/06/2013, 17:03

HI all,

is there any update on this ? Cannot believe that I am the only one that have this issue !!!

thx.

ejosvp
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Re: backlight off when brightness under a certain level

Postby ejosvp » 14/07/2013, 0:46

I have the same problem, did you find any solution?

mrDoctorWho
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Re: backlight off when brightness under a certain level

Postby mrDoctorWho » 14/07/2013, 9:21

try this (will work only when you run from battery):

add to /etc/rc.local before "exit 0":

Code: Select all

if !(on_ac_power); then
echo 3 > /sys/class/backlight/samsung/brightness
fi


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