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I'm using 12.04 with up to date packages running on a Dell Inspiron N4030 laptop with an ATI Radeon HD 5400 graphics card. I'm using the new Catalyst 12.6 graphics driver (this version already fixed various bug with linux kernel 3.0)

The problem is when I reduce the brightness and then restart it. The brightness is not saved, even when I use a startup script:

cat /etc/rc.local
"echo 0 > /sys/class/backlight/acpi_video0/brightness"

When I use this script, it works initially, but then after a second the brightness changes to level 15 as if a second script is at work. Sometime when I am logged in the brightness will increase without input from me as well.

Is there is any solution?

Peachy
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Ahmad Nazirul
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1 Answers1

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If you're reducing the brightness using the buttons provided on the laptop, try this.

Open System Settings and go to Brightness & Power. Adjust the brightness and close the window. Hopefully, the settings would be saved.

Using `xbacklight`

There is an utility called xbacklight that lets you set the brightness of your screen.

Installing: sudo apt-get install xbacklight

Increasing/Decreasing the brightness: xbacklight -set X% where X is between 0 to 100.

You can add this in "Startup Applications" or add this command to /etc/rc.local.

green
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