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Thank you for providing the great script qgj. It's sad that this bug still persists and the work-around is needed. I had the same issue as James getting an error due to the options no longer being valid with nvidia-settings for my specific display type. As luck would have it, there is a better setting available for backlight brightness. I have modified ...


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You can do that by going into the Global Shortcuts control panel in System Settings and, under the "kded" section, remove the key binding for brightness up and brightness down.


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For me, solution listed here helps - https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1249219/comments/30 Basically it works creating the /usr/share/X11/xorg.conf.d/20-intel.conf file with the following lines: Section "Device" Identifier "card0" Driver "intel" Option "Backlight" "intel_backlight" BusID "PCI:0:2:0" ...


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I am unsure about the changes that you are doing to grub and trying to install xbacklight. But there are some good guides out there. An article from itsfoss worked for me. Before you try out the article, open up terminal and key in acpi_listen and then press your fn+up and fn+down key combinations to check whether your brightness keys are actually getting ...



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