Today was my first contact with Linux OS (I pretty much do not know anything about Ubuntu). I installed Ubuntu 16.04.3 dual boot with windows 10 and everything was working. When I tried to change the screen brightness it went dark and the keys for changing brightness are not working.
I have already tried the following solutions:
Brightness key not working Ubuntu 16.04 LTS - Exactly same problem as me, except my laptop is Lenovo IdeaPad P400 touch
Can't change brightness in Ubuntu 16.04 LTS - Tried both the solution given by @Archisman Panigrahi and by @Serge Stroobandt
Ubuntu 14.04 brightness problem (Lenovo Z500) - tried solution given by @Lorenzo Gabriele. Solution similar to second link
That same problem happened to me on windows every time I updated the system. The solution was to go the video driver setting and apply the old version of the driver. I tried the similar thing:
Moreover, I read here that "Intel graphics driver is part of the xserver-xorg-video-intel driver package", but when I execute the following:
sudo apt-get install xserver-xorg-video-intel
E: Unable to correct problems, you have held broken packages. as shown below:
Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: xserver-xorg-video-intel : Depends: xorg-video-abi-20 Depends: xserver-xorg-core (>= 2:126.96.36.1992) E: Unable to correct problems, you have held broken packages.