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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Changing the grub command line is the right way to do it, but the problem is that
acpi_backlight=vendor is wrong. The correct one is:
It still always worked for me on a lot of laptops.
The solution from @RoQ is working fine. Here are the steps :
- Edit the /etc/default/grub file with superuser privilege
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor acpi_osi=Linux"
- Update the grub with the following command :
sudo update-gruband reboot your computer
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.
For mint mate 17, you can set the default brightness by following steps:
- sudo apt-get install dconf-tools
- Applications -> System Tools -> dconf tools,
- search for backlight, find and change following options:
brightness-ac: brightness when use AC powser (charged),
brightness-dim-battery: brightness when use battery (not charged),
For all of you running a Laptop with NVIDIA Card and who are still not able to get the f* function keys for brightness to work, just follow the steps below. It worked very well for my system (Samsung q45, Intel Dualcore T7100 @ 1,8Ghz , Nvidia Geforce 8400M G 512) running Linux Mint 17.
In command line, type in:
sudo gedit /etc/X11/xorg.conf
You will have to enter your root password.
Now, you should see:
Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" EndSection
If you see nothing, just enter all the lines above and follow up with the next step below
Under the VendorName Line, add the following:
Option "RegistryDwords" "EnableBrightnessControl=1"
Now, save and reboot. Check your brightness controls, and hopefully this fixed things.
I've tried so many solutions out of the net and nothing had helped me until I came to this solution. But be aware that these steps only working for NVIDIA Grafics and you must have chosen the NVIDIA Driver in your system in "Administration -> Driver Manager".
acpi_osi= to grub and this helped my Acer 5742z with intel graphics.