Brightness Button doesnt work Asus X453M

[nknwn]

Neither Ubuntu 14.04 or Lubuntu 14.04.3 remember my brightness settings but that is not a problem on this laptop as they both enable the brightness buttons.

In the absence of a solution for you buttons here's what I recommend:

From the Ubuntu software centre install xbacklight
You can then change the brightness by running the command xbacklight = 60 in the Terminal where 60 is 60% brightness.

But it would be better if you had a script file which when double clicked set your preferred brightness IMO.

Open up gedit the text editor and enter:

#!/bin/bash
xbacklight = 60

Save the file with an appropriate name such a 'mydimmer.sh' or whatever you prefer it doesn't need a filename extension.
Now right click on the file, choose properties and select execute in the permissions.

One more setting - this is system wide.
From the menu bar when a directory/folder is maximized choose edit > Preferences > Behaviour > run executable text files when they are opened > close


Now you can double click on your script file to set the brightness you prefer.

[anonprophet]

anonprophet@anonbook:~$ uname -a

Linux anonbook 3.19.0-28-generic #30~14.04.1-Ubuntu SMP Tue Sep 1 09:32:55 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

anonprophet@anonbook:~$ cat /proc/cmdline

BOOT_IMAGE=/boot/vmlinuz-3.19.0-28-generic.efi.signed root=UUID=aedfc7ac-79f1-40ab-8c5b-dcca1fa93245 ro quiet splash acpi_osi=Linux vt.handoff=7

anonprophet@anonbook:~$ for interface in /sys/class/backlight/*; do echo -e "\n $interface"; cat $interface/{brightness,max_brightness,actual_brightness}; done

 /sys/class/backlight/intel_backlight
3046
7812
3046

anonprophet@anonbook:~$ cat /var/log/Xorg.0.log | grep -i backlight

[    21.343] (**) intel(0): Option "Backlight" "intel_backlight"
[    21.344] (**) intel(0): Found backlight control interface intel_backlight (type 'raw') for output eDP1

[Toz]

Do the following commands change your brightness level (you will need to enter your password):

echo 7812 | sudo tee /sys/class/backlight/intel_backlight/brightness
echo 3046 | sudo tee /sys/class/backlight/intel_backlight/brightness

Does the brightness slider work?

Do the brightness keyboard combinations work?

[anonprophet]

Do the following commands change your brightness level (you will need to enter your password):

echo 7812 | sudo tee /sys/class/backlight/intel_backlight/brightness
echo 3046 | sudo tee /sys/class/backlight/intel_backlight/brightness

Does the brightness slider work?

Do the brightness keyboard combinations work?

1. the command work
2. brightness slider in Settings work
3. if u mean Fn + F5 and Fn + F6 its doesnt work

sorry for late reply

[Toz]

So it's just the keyboard shortcuts that don't work.

Two things to try:

1. In a terminal window, run:

xev | sed -n 's/^.*state \([0-9].*\), keycode *\([0-9]\+\) *\(.*\), .*$/keycode \2 = \3, state = \1/p'

...then press Fn+F5 and Fn+F6. Post back any messages that appear in the terminal window.

2. In a terminal window, run:

acpi_listen

...then press Fn+F5 and Fn+F6. Post back any messages that appear in the terminal window.

[anonprophet]

nothing showed up if press fn+f5 & fn+f6
but if i press fn+f11 / fn+f12 (lower and raise volume) like this

1.

keycode 122 = (keysym 0x1008ff11, XF86AudioLowerVolume), state = 0x0
keycode 123 = (keysym 0x1008ff13, XF86AudioRaiseVolume), state = 0x0

2.

button/volumedown VOLDN 00000080 00000000 K
button/volumeup VOLUP 00000080 00000000 K

[Toz]

Your system isn't recognizing your function hotkeys. Earlier you tried "acpi_osi=" (which btw is a valid kernel parameter). Can you try the following grub parameters:

acpi_osi= acpi_backlight=vendor

Once booted into your system, can you post back the results of:
1. Kernel boot line:

cat /proc/cmdline

2. Recognized backlight interfaces:

for interface in /sys/class/backlight/*; do echo -e "\n $interface"; cat $interface/{brightness,max_brightness,actual_brightness}; done

3. And try both:

xev | sed -n 's/^.*state \([0-9].*\), keycode *\([0-9]\+\) *\(.*\), .*$/keycode \2 = \3, state = \1/p'

...and:

acpi_listen

...again to see if you get a response.

[anonprophet]

1.

BOOT_IMAGE=/boot/vmlinuz-3.19.0-28-generic.efi.signed root=UUID=aedfc7ac-79f1-40ab-8c5b-dcca1fa93245 ro quiet splash acpi_osi= acpi_backlight=vendor vt.handoff=7

2.

 /sys/class/backlight/asus-nb-wmi
10
10
10

 /sys/class/backlight/intel_backlight
2343
7812
2343

3. Nothing Show Up even though FN + F11 / F12 (all combination with FN not work)

4.
FN + F5

 PNP0C14:00 000000ff 00000000

FN + F6

 PNP0C14:00 000000ff 00000000

This command and brightness slider in settings work

echo 7812 | sudo tee /sys/class/backlight/intel_backlight/brightness
echo 3046 | sudo tee /sys/class/backlight/intel_backlight/brightness

[Toz]

Try this combination in your /etc/default/grub file instead:

acpi_osi=\"! Windows 2012\" acpi_backlight=vendor

...and post back the results as before.

[anonprophet]

BOOT_IMAGE=/boot/vmlinuz-3.19.0-28-generic.efi.signed root=UUID=aedfc7ac-79f1-40ab-8c5b-dcca1fa93245 ro quiet splash "acpi_osi=! Windows 2012" acpi_backlight=vendor vt.handoff=7

 /sys/class/backlight/asus-nb-wmi
100
100
100

 /sys/class/backlight/intel_backlight
2343
7812
2343

3 & 4 Nothing Show for FN + F5/F6