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I can't change the screen brightness on my Fujitsu Amilo li3710. Pressing the keys (Fn+Brightness up) or sliding the bar in Brightness&Lock has no effect. It worked on windows so the function is supported by the hardware. Thanks for your help.

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I have the same setup. I just tried, and it works. Try sudo apt-get update && sudo apt-get upgrade. – Mitch May 23 '13 at 16:09
I tried but still not working :(. Could you provide more details regarding your system? Are you using 32 or 64 bits version? – user1377000 May 23 '13 at 16:36
Have you tried adding acpi_backlight=vendor to /etc/default/grub? If not open the terminal and type sudo gedit /etc/default/grub and where it says GRUB_CMDLINE_LINUX="quiet splash" change it to say GRUB_CMDLINE_LINUX="quiet splash acpi_backlight=vendor". Now save this file, and then in the terminal type sudo update-grub to apply the changes you just made. Reboot and then test the brightness controls! – Merri May 23 '13 at 22:19
That's amazing, thanks! there was GRUB_CMDLINE_LINUX="" and GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"; I made them both "quiet splash acpi_backlight=vendor". I can now dim the brightness from Brightness&Lock. The Fn key binding is not working though, any ideas on how I might get that working? Thanks. – user1377000 May 23 '13 at 22:48

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