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I'm trying to fix the backlight issue on my Macbook Pro Retina after installing Ubuntu 16.04.

The problem is the backlight dimmer buttons F1 F2 or Fn+F1 and Fn+F2 are not working at all after installing Ubuntu 16.04.

I have run in some answers that recommends to set the acpi_backlight=vendor on the GRUB_CMDLINE_LINUX_DEFAULT parameter and rebooting it and still not working.

Also I've tried this other workaround https://itsfoss.com/fix-brightness-ubuntu-1310/ but the ls /sys/class/backlight/ directory returns different files, I've also tried to set some configuration similar to the one proposed on the link but then I got an error at booting Ubuntu on the graphics card.

Have anybody figured this out?

Rubiks
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3 Answers3

3
  1. In the Terminal application enter:
sudo nano /usr/share/X11/xorg.conf.d/10-nvidia-brightness.conf
  1. Paste:
Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "[GPU]"
    Option         "RegistryDwords" "EnableBrightnessControl=1"
EndSection
  1. In a new terminal tab (Control + T) or window enter:

lspci | grep -i --color 'vga\|3d\|2d'

  1. In the first terminal substitude the word [GPU] for the name between brackets shown in the second terminal, leaving out the brackets.

  2. Save the document in the first terminal (Control + O), and reboot the computer.

Alberto Salvia Novella
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1

For me, adding the setpci command to /etc/rc.local worked, but only after I also added the shebang #!/bin/sh and made the file executable. This could be the reason why that solution doesn't work for people in whose systems rc.local didn't already exist.

Paul
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Greg
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0

This may be helpful:

# grab copy of source
curl -O https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.8.7.tar.xz
tar xf linux-4.8.7.tar.xz
cd linux-4.8.7/drivers/platform/x86

# patch it
curl -o file.patch https://bugzilla.kernel.org/attachment.cgi?id=218051
patch apple-gmux.c < file.patch

# build it
echo '
obj-m += apple-gmux.o

all:
  make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:
  make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
' > Makefile
make

# install
targetDir="/lib/modules/$(uname -r)/kernel/drivers/platform/x86"
sudo cp ${targetDir}/apple-gmux.ko ${targetDir}/apple-gmux.ko.backup
sudo cp apple-gmux.ko ${targetDir}

reboot

Source: https://bugzilla.kernel.org/show_bug.cgi?id=105051#c37

extr15
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