Bright problem

[navidhs10]

Hello! Thnx to all for your answers.

Now my problem is the following:

When i installed my Debian 9 (stretch) i did note that my bright configuration with the fn keys doesnt work.
So searching in the web i find one solution and it work, now my fn key for bright change works good... But, the bright intensity dont... i mean i can see how the bars for bright in my desktop go up or down but the real brigth in my screen is the same in both situations, please, if you can help me to solve that, my eyes will thanks you. ^^

PD: Srry for my english

[bw123]

You need to adjust what the key does, you should have a file somewhere, maybe
/proc/acpi/video/VID*/LCD/brightness
or
/sys/class/backlight/acpi*/brightness
and that file will be the key to solving it.

try the arch wiki called backlight, it's pretty good. https://duckduckgo.com/html/?q=arch+wiki+backlight

[navidhs10]

thnks you bw123 for your answer... I was tried changing the file "brightness" but the result is the same... My function keys are working well but the bright of my screen dont change.

[bw123]

thnks you bw123 for your answer... I was tried changing the file "brightness" but the result is the same... My function keys are working well but the bright of my screen dont change.

You tried changing the file "brightness" how? Show it with code tags like this:

Code: Select all

$ ls /sys/class/backlight/
acpi_video0
$ ls /sys/class/backlight/acpi_video0
actual_brightness  brightness  max_brightness  subsystem  uevent
bl_power           device      power           type
$ cat /sys/class/backlight/acpi_video0/brightness 
10

[navidhs10]

You tried changing the file "brightness" how? Show it with code tags like this:

Code: Select all

$ ls /sys/class/backlight/
acpi_video0
$ ls /sys/class/backlight/acpi_video0
actual_brightness  brightness  max_brightness  subsystem  uevent
bl_power           device      power           type
$ cat /sys/class/backlight/acpi_video0/brightness 
10

i did the following:

Code: Select all

$ cd /sys/class/backlight/acpi_video0
$ ls
actual_brightness  brightness  max_brightness  subsystem  uevent
bl_power           device      power           type
$ cat max_brightness
10
$ cat brightness
6
$ sudo gedit brightness

Then i did change the value to 4 (for example) and save it

Code: Select all

$ cat brightness
4

[bw123]

you did not show that in /sys/class/backlight folder, acpi_video0 is the only entry? If there's another entry then try that one. Also the wiki link had a suggestion or two for when this does not work.

there's usually no need to use gedit or anything, just use echo

Code: Select all

/sys/class/backlight/acpi_video0$ su -
Password: 
root@host:/sys/class/backlight/acpi_video0# echo 4 > brightness 
root@host:/sys/class/backlight/acpi_video0# echo 12 > brightness

[navidhs10]

Yes, is the only one folder in the "brightness" directory..

there's usually no need to use gedit or anything, just use echo

Code: Select all

/sys/class/backlight/acpi_video0$ su -
Password: 
root@host:/sys/class/backlight/acpi_video0# echo 4 > brightness 
root@host:/sys/class/backlight/acpi_video0# echo 12 > brightness

Oh! Thanks for that! haha