The laptop is an Asus FX53vd. Its back-light after booting into my Slack 14.2 is always on. There are two function keys which, when I would be in Windows, can be used to adjust the brightness (from very bright to total off) of the back-light.

In my Slack, I've not figured out a way to make the adjusting keys work. I have the following WMI related information from dmesg:

I am guessing there should exist some GPIO virtual file that can be write in one or zero to control the keys but I have no more knowledge about that.

Does someone get any experience? Thanks in advance.

-woody

I like to give more findings. I found in the kernel it's the asus-laptop driver which should control the keyboard backlight, but this module was not loaded. Then I tried to manually load it with modprobe and insmod, I got an erro: No such device. Then I traced the driver execution and found the 'asus_acpi_add()' function was never got called. I also noticed there is a device id table which includes some id's ATK****, so I am guessing, does it mean my laptop need a new ID entry? Who has more info about these ATK id's and what are they for?

Thanks.

Hi narke, I have several Asus laptops and I tested a few elaborate scripts to handle keyboard backlight, using keybindings in i3 or DWM.

I later noticed that xfce4-power-manager is able to do the job with less effort. Open xfce4-power-manager-settings and simply activate 'Handle display brightness keys.' On all my devices, that enables the keyboard backlight keys.

Slackware includes xfce already, and even if you didn't install it, you can use the power manager as a stand-alone.

I don't get it. I started the xfce4 and launched the power-manager, I found the "handle display brightness keys" already activated. But I still cannot operate my keyboard brightness adjusting keys. And, from logic, I still don't understand why 'display brightness key' has something to do with 'keyboard backlight keys'. In additional, I want to report, I cannot run xfce4-power-manager in KDE or via other stand-alone mode, I have to start it from xfce4 application menu in the xfce4 environment.

Thanks.

According to

https://ubuntu-mate.community/t/keyb...unlock/6914/29


To disable the keyboard backlight completely, including the keyboard function keys
that controls the keyboard backlight on-off-dimer switch,

Edit the Linux file:

# vim /etc/dbus-1/system.d/org.freedesktop.UPower.conf

and in the 2 lines that contain 'KbdBacklight', change from 'allow' to 'deny'.

from:

<allow send_destination="org.freedesktop.UPower.KbdBacklight"
send_interface="org.freedesktop.DBus.Properties"/>

to:

<deny send_destination="org.freedesktop.UPower.KbdBacklight"
send_interface="org.freedesktop.DBus.Properties"/>

and from:

<allow send_destination="org.freedesktop.UPower"
send_interface="org.freedesktop.UPower.KbdBacklight"/>
to:

<deny send_destination="org.freedesktop.UPower"
Asend_interface="org.freedesktop.UPower.KbdBacklight"/>

In my particular case: Asus 304AUK, Linux Mint 18.3, kernel 4.4-70, upstart,
changing only the second line one worked best for me.

For me the setting take effect immediately upon saving the file, no restart needed.

This link might help, https://unix.stackexchange.com/quest...-using-hotkeys
If you can get it working from the command line, then can get a script for the function keys to call.