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I know it is a bit late but I had the exact same problem with my girlfriend's computer, a Toshiba Satellite L645D with Ubuntu 14.04 LTS. I think this fix should also work on this computer model with other Debian-related Distros. After searching and trying everything in the web I found this page: Keybinding to change brightness by way of acpi brightness ...


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When booting - highlight Try Ubuntu without installing - press the E key. Add nouveau.modeset=0 to the end of the linux line - press F10 to boot. After you completed Ubuntu installation, do the same on first system start. Highlight the Ubuntu entry in the GRUB boot menu and press the E key. Add nouveau.modeset=0 to the end of the linux line - press F10 ...



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