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I'm on the latest Linux Mint release on an Acer Aspire S3. Unfortunately I can't set the screen brightness in the Screen preferences. It doesn't matter which position the slider has, it's always the same brightness. Am I doing something wrong? Is there another way to set the brightness?

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this still happens with Linux Mint 13 (Maya) –  Michael Kohler May 23 '12 at 21:28
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4 Answers

up vote 2 down vote accepted

I have a similar problem with my screen and found this solution, hope it helps you

http://www.mydellmini.com/forum/dell-inspiron-11z/25932-solution-screen-brightness-linux-mint.html

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This works perfectly! Now I can set the brightness with my FN keys. –  Michael Kohler Sep 11 '12 at 16:59
    
Please add the relevant information from that link to your post. As it is, when that link goes bad (it's not working right now), your answer is useless to people at large. –  Mat Sep 22 '12 at 15:40
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I am looking at fixing this in my LMDE 13 and came across this How do I set default brightness after boot?.

It has fixed it for many, however in my case, I am not able to find a directory in /sys/class/backlight. Perhaps that means a proper driver is not loaded.

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Thanks for your reply. That would be a workaround, but I actually also need to be able to adjust the brightness using the FN key and not just telling it how bright the screen should be. When I'm on battery I don't want it to be max brightness, on AC I do. –  Michael Kohler Sep 11 '12 at 16:19
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The solution from @RoQ is working fine. Here are the steps :

  • Edit the /etc/default/grub file with superuser privilege
  • Change GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
  • Update the grub with the following command : sudo update-grub and reboot your computer

That's it

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I added acpi_osi= to grub and this helped my Acer 5742z with intel graphics, hope this helps you.

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