Brightness shortcut doesn't work right on an Acer Aspire 5750G

I have an Acer Aspire 5750G with Ubuntu 12.10.

I have a problem with the brightness shortcut. If I press Fn+Right Arrowand Fn+Left Arrow, the brightness actually changes but not in the right way. On the other hand, when I type in the terminal gnome-control-center screen, I can adjust the brightness in the proper way.

Is it possible to adjust the brightness of the laptop in the right way using the shortcut?

Remark: I found a lot of questions on AskUbuntu regarding brightness issues but here the problem is different; both "Brightness and Lock" and shortcuts work right now, but shortcuts do not work in the right way!

3 Answers

Problem solved:

I finally discovered that using the shortcut would have had the effect of XF86MonBrightnessUp or XF86MonBrightnessDown while the effect I want is given by replacing those commands in the shortcuts with xbacklight +10% and xbacklight -10%.

Of course one has to install xbacklight just typing in the terminal:sudo apt-get install xbacklight

I don't know if there are smarter solutions to the problem but this one satisfies me.

You can try adding a parameter to /etc/default/grub.

Run this in a terminal:

sudo gedit /etc/default/grub

Search the line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

And add the parameter: *acpi_backlight=vendor*

It should look like this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

Save and close. Then update the grub with:

sudo update-grub

And restart your system to test if it works.

1

I am using Ubuntu GNOME 17.04 on an Acer Aspire 5750G and I had the very same problem. Here is how I fixed it somehow.

Run this in a terminal:

sudo gedit /etc/default/grub

Search the line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

And add the parameters: acpi_osi=Linux and acpi_backlight=vendor

It should look like this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"

Save and close. Then update the grub with whichever works for you:

sudo update-grub

or

sudo update-grub2

Then restart your system. After these changes I am able to change the screen brightness with hotkeys but the visual brightness indicator disappered unfortunately.

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