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Copy-Paste from here this answer. First sudo sed 's/GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"/GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="/' -i /etc/default/grub Second sudo update-grub Reboot your system and see if Fn (for brightness) works. By NikTh


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It seems to be a bug that is being worked on, this link explains: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1391545


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Here is the summary of what I did: I created the file /usr/share/X11/xorg.conf.d/20-intel.conf as described here 13.10 Can't Adjust Dell Laptop Backlight: Section "Device" Identifier "card0" Driver "intel" Option "Backlight" "intel_backlight" BusID "PCI:0:2:0" EndSection Then I changed one line ...


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Try to just close the computer (so that it goes to sleep) and open it up again, seems to solve the problem for many, includning me. havent seen a good answer to why it works yet.. I have the same issue on a Dell Latitude E7440


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Try these: Redownload the ISO, as it could be corrupt (If you're on Windows) Try use a program such as Universal USB Installer Try use UNetbootin (Windows, Mac and Linux) It could be something to do with UEFI; if so I'm no help there as I don't have a UEFI machine.



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