anacondaIdemásolom azt a részt, amit lépésről lépésre megismételtem:
Two years ago I bought this laptop which works pretty well with Linux. When I upgraded to my new distro, Elementary OS Freya, I noticed the problem that backlight was unable to change. I could change it only on grub screen. After trying every guide on the internet I partially solved the issue by downgrading the kernel (and the related Intel graphics driver) to version 3.13. Yesterday I gave another try. It was very lucky :)
Here the solution:
On the grub configuration file /etc/default/grub modify the following line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
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by adding this string: acpi_backlight=vendor.
In my case it is:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
Update grub by launching:
sudo update-grub
Then create a xorg configuration file like this:
/usr/share/X11/xorg.conf.d/80-backlight.conf
and copy in it this text:
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "sna"
Option "Backlight" "ideapad"
BusID "PCI:0:2:0"
EndSection
Save the file, Reboot, Enjoy :-)
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