Thanks Neil! This method works fine. I hope someday somebody will fix it. In any case, I'll leave it here:
Step 1: Fire a terminal (Obviously) Step 2: Finding the correct module. Run the following command: $ ls /sys/class/backlight/ This should list down two modules: acpi_video0 and intel_backlight We need to know which module is exactly controlling the brightness. Run the below command: (You need to be root) # tee /sys/class/backlight/acpi_video0/brightness <<< 5 If nothing happens, then intel_backlight is the one handling the brightness settings. Step 3: Modifying the bootloader. Next step is modifying the file /etc/default/grub. (Why modify /etc/default/grub and not /boot/grub/grub.cfg) # nano /etc/default/grub Insert the below four lines: GRUB_CMDLINE_LINUX="acpi_backlight=none" GRUB_CMDLINE_LINUX="acpi_backlight=video" GRUB_CMDLINE_LINUX="acpi_backlight=vendor" GRUB_CMDLINE_LINUX="acpi_backlight=native" After that save and close the file. (Root access needed) Run (as root): # update-grub Step 4: Reboot your system. Step 5: Verification After reboot, fire the terminal one last time and Run the following command: $ ls /sys/class/backlight/ 12 Voila!!!! acpi_video0 is gone! Check the fn+Brightness keys or change the brightness via the applet. Brightness controls should work just fine. Additional info: https://wiki.archlinux.org/index.php/Backlight -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1724933 Title: I can't adjust display brightness To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1724933/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
