Ubuntu 14.04, why is brightness not adjustable after nvidia driver update?

Question

linux

Who faced? Driver downloaded from site. Everything was installed without problems. Solved some problems with this. Now I can't adjust the brightness.
I have a samsung laptop. I also installed Samsung's special utilities. And I wrote lines in sudo gedit /etc/default/grub line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor". And still nothing. The brightness slider runs but to no avail ...

Answer 1

1. Open the Terminal
2. Give the command in the Terminal:
and press the “Enter” key on the keyboard
3. Enter your password, after which the Grub file will open in the Gedit editor window, where we find the line:
4. Change the found line to
5. We save, close the Gedit editor and write the command in the terminal:
It helped me