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Well this is a common problem as i have seen through my google searches but i didn't manage to find any satisfactory solution so far. I got my laptop recently which came with windows 8 pre-installed.I decided to install ubuntu (i had it in my former laptop) but the main problem is that when ubuntu starts the brightness is 0 be default(my laptop has a backlit button too). I can use the Fn buttons to change back to what i want but i wondered if there is a solution after all. The only solutions i found so far set the brightness in a default value which fix the low brightness problem after the start up but i cant control the brightness with the fn buttons afterwards. If anyone has a solution please share. Thanks in advance. ps my laptop is Lenovo G510

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1 Answer 1

Reset to default
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Well this might be a workaround

Edit you rc.local file which will run on each startup,

sudo gedit /etc/rc.local

to write there something like,

echo 100 > /sys/class/backlight/intel_backlight/brightness

or 

echo 100 > /sys/class/backlight/acpi_video0/brightness

depending on what defines your system brightness.

you can find out which brightness value is best for you by looking in the "actual_brightness" file. Then change the 100 for that number.

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  • Your welcome. Please help me back and accept my answer. It is the button under the vote up and down arrows ;)
    – Presbitero
    Mar 3, 2014 at 11:17
  • For my G510 I needed echo 3000 > /sys/class/backlight/intel_backlight/brightness. The original value was 5273. I'm running 12.04 LTS btw
    – Scooby-2
    May 7, 2014 at 19:23

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