adjust your screen’s brightness level on Ubuntu at myosis

Sometimes, you can’t adjust brightness easily on Ubuntu : Fn buttons might not configured properly.

You can run the following command in a Terminal and set your brightness level to 100

#sudo echo 100 > /proc/acpi/video/NVID/LCD/brightness

Let me precise several details below

sudo let’s you run the following command as root. If this doesn’t work, please switch to root by executing
```
#sudo sh
```
command and then run the previous command without “sudo” to adjust your brightness level :
```
#echo 100 > /proc/acpi/video/NVID/LCD/brightness
```
100 is my video card’s maximum brightness level, yours might be different or you might want to reduce the brightness. So, in order to learn your screen’s brightness levels, run the following command under root :
```
# cat /proc/acpi/video/NVID/LCD/brightness
```
According your video card, the adjust file might be in a different folder. /proc/acpi/video is the main folder for your screen. Therefore, search with the following command in your video folder :
```
#ls /proc/acpi/video
```
When you find NVID, or VGA, or anything similar, look for the subfolder LCD and then brightness

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