I've just installed Ubuntu 16.04 on my Lenovo Z400 notebook and everything was working. Today I tried to change the brightness of the screen and it gets dark and I can't go back. Can anyone help me?
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I faced the same problem before on my laptop Lenovo z500 ideapad after searching i found this solution :
sudo nano "/etc/default/grub"
acpi_backlight=vendor to the
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
nano(Ctrl+X, then confirm saving changes)
If nothing changes , you can check the solutions of this question.