Question

3

Brightness keys adjust brightness too many times

rated 0 times [ 3] [ 0] / answers: 1 / hits: 1329 / 1 Year ago, sun, december 4, 2022, 9:17:15

Every time I hit a brightness key on my laptop's keyboard, it adjusts the brightness by three steps instead of one. How can I fix it so that it only adjusts one step at a time?

I am using an Acer Aspire D250 with the newest firmware. It was working better when I was using Ubuntu 10.10 with older firmware (although the scale was off).

Any tips on debugging this would be appreciated.

Edit: My graphics:

00:02.0 VGA compatible controller: Intel Corporation Mobile 945GME Express Integrated Graphics Controller (rev 03)

/sys/class/backlight$ ls

acpi_video0  intel_backlight

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answered 1 Year ago confiorc · Accepted Answer

I had a smiliar problem:

I run Ubuntu 12.04 on my netbook (Acer Aspire One D255E) and I have
the following problem with the brightness settings: If I want to
adjust the brightness with the fn-key, I can only change between three
brightness steps, but my netbook has nine brightness steps.

Ruben Bakker gave this instructions, which solved the problem.

Easy fix. In the terminal:
gksudo gedit /etc/default/grub
You will find this line in the new opened window:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
Change it to:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
Save and close the window and type this in the terminal:
sudo update-grub
Then reboot. Rejoice :)

Link:
Problem with brightness settings with Acer Aspire One D255E in 12.04