Ubuntu – Hot keys brightness issues with Ubuntu 14.10 in Acer Aspire 5755

14.10acerbrightnessgrub2shortcut-keys

I have a Acer Aspire 5755 with Intel video graphic, on Ubuntu 14.04, the combination Fn+←/→(Right/left) arrows can increase/decrease the brightness screen. Works fine on unity and with a grub modification (boot flags acpi_osi=Linux and backlight=vendor) the hot key work on any desktop environment.

I make a direct upgrade to 14.10, and the hot key can not work, even with grub modification. But i can chance the screen brightness in System settings → Brightness and Lock.

ls /sys/class/backlight/
intel_backlight

Anyone have a solution?

Best Answer

I make some tests removing the grub flags. It doesn't work, but when I reintroduce the flags 

GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_backlight=vendor splash"

and run sudo update-grub the hot keys start to work again. Now I can control the screen brightness with key combination.

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