sm@D430:~$ ls /sys/class/backlight
dell_backlight intel_backlight
There's no "acpi_video0", so I can't try the instruction you've provided.
The problem with the backlight is the following. The screen of the laptop I use has different levels of brightness and usually I use maximum. But if I do not use the the laptop and close the lid the screen goes blank and after opening the lid again I see that the brighness is minimum and I hardly see anything. It is possible to increase the brightness using the brightness up key but I must admit they don't function properly. That means if you continuously press brightness up key the brightness goes this way: level +1 then minimum then level +1 then minimum then level +1 then minimum and so on... But it is possible to set it to the maximum level again.
Kamal, here are the answers
sm@D430:~$ ls /sys/class/ backlight
dell_backlight intel_backlight
There's no "acpi_video0", so I can't try the instruction you've provided.
The problem with the backlight is the following. The screen of the laptop I use has different levels of brightness and usually I use maximum. But if I do not use the the laptop and close the lid the screen goes blank and after opening the lid again I see that the brighness is minimum and I hardly see anything. It is possible to increase the brightness using the brightness up key but I must admit they don't function properly. That means if you continuously press brightness up key the brightness goes this way: level +1 then minimum then level +1 then minimum then level +1 then minimum and so on... But it is possible to set it to the maximum level again.