screen brightness in linux deepin

cmdywrtr27 · 11-01-2019, 08:47 PM

hi, i hope i am in the right forum. i am new to linux so don't have the best knowledge on how to fix things but i am having an issue with my screen brightness. the fn plus f12 buttons show the screen at maximum brightness but it is incredibly hard to see. when i plug in an extra monitor through hdmi, that screen brightness is great but on my laptop it is almost impossible to see. is this a known issue or is there a fix for this?

any help is greatly appreciated.

CyDFect · 11-05-2019, 07:17 AM

The screen brightness information is usually stored in /sys/class/backlight, for me on a Thinkpad x200 it's /sys/class/backlight/intel_backlight/brightness. If you want to change the brightness without installing any external program you should look around in there, there should be a max_brightness file too.

The easiest method though is using xbacklight (you might have to install it). You can use it to change the screen brightness with

Code:

xbacklight -set <0-100>

ondoho · 11-05-2019, 12:51 PM

Quote:

Originally Posted by CyDFect

The screen brightness information is usually stored in /sys/class/backlight, for me on a Thinkpad x200 it's /sys/class/backlight/intel_backlight/brightness. If you want to change the brightness without installing any external program you should look around in there, there should be a max_brightness file too.

In other words: assuming the number in the max_brightness file is 100, you should be able to do the following:

Code:

$ sudo -i
# echo 100 > /sys/class/backlight/intel_backlight/brightness

Quote:

The easiest method though is using xbacklight (you might have to install it). You can use it to change the screen brightness with

Code:

xbacklight -set <0-100>

I heard somewhere that xbacklight does not always work; you could try light instead.