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How to permanently set screen brightness level in Ubuntu 12.04 on Dell Vostro 2420 laptop?

rated 0 times [ 12] [ 0] / answers: 1 / hits: 13646 / 1 Year ago, mon, march 13, 2023, 9:59:40

On Ubuntu 12.04 LTS on a Dell Vostro 2420 laptop, each time I start Ubuntu, the screen brightness is set to the maximum level, which gives a high glare. (I have recently installed Ubuntu on the laptop, but did not change any default settings related to brightness, IIRC.) I am currently lowering the brightness manually each time after starting, using the System Settings icon on the left of the screen. Looking for a permanent way to set it to a lower value.

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nsuainner

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answered 1 Year ago ilityushing · Accepted Answer

After you set the brightness to your desired level open up a terminal and check what the brightness is set to by using

cat /sys/class/backlight/acpi_video0/brightness

Then you can take that value and

sudo gedit /etc/rc.local

Right above exit 0 add

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

and then save the file. This will permanently set the brightness to your value as rc.local is executed at each reboot.

Note: This only works if you have a file named brightness in /sys/class/backlight/acpi_video0/