Udev rules to turn off keyboard backlight on Asus UX32VD AFTER login

Question

Hi,
I would like to turn off the keyboard backlight everytime my laptop starts.
I looked at :
https://wiki.archlinux.org/index.php/As … _Backlight
So I created a rule :
/etc/udev/rules.d/kbd_backlight.rules
SUBSYSTEM=="leds", ACTION=="add", KERNEL=="asus::kbd_backlight",DRIVERS=="asus-nb-wmi", ATTR{brightness}="0"
It works quite fine, after the boot the keyboard turns OFF.
But at GNOME login it goes ON again.
I found this :
https://wiki.archlinux.org/index.php/Ba … ht_service
and masked
systemctl mask systemd-backlight@leds:asus::kbd_backlight.service
No more success...
On grep later I masked this one :
systemctl mask sys-devices-platform-asus\x2dnb\x2dwmi-leds-asus::kbd_backlight.device
Nothing new.
On more grep and I commented this :
/lib64/udev/rules.d/99-systemd.rules
# SUBSYSTEM=="leds", KERNEL=="*kbd_backlight", TAG+="systemd", IMPORT{builtin}="path_id", ENV{SYSTEMD_WANTS}+="systemd-backlight@leds:$name.service"
I tried to understand a bit more with this, but without success:
https://wiki.archlinux.org/index.php/Ud … f_a_device
udevadm info -a -p /sys/class/leds/asus\:\:kbd_backlight
Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.
looking at device '/devices/platform/asus-nb-wmi/leds/asus::kbd_backlight':
KERNEL=="asus::kbd_backlight"
SUBSYSTEM=="leds"
DRIVER==""
ATTR{brightness}=="0"
ATTR{max_brightness}=="3"
ATTR{trigger}=="[none] cpu0 cpu1 cpu2 cpu3 AC0-online rfkill0 phy0rx phy0tx phy0assoc phy0radio BAT0-charging-or-full BAT0-charging BAT0-full BAT0-charging-blink-full-solid rfkill2 rfkill3 "
looking at parent device '/devices/platform/asus-nb-wmi':
KERNELS=="asus-nb-wmi"
SUBSYSTEMS=="platform"
DRIVERS=="asus-nb-wmi"
ATTRS{lid_resume}=="0"
looking at parent device '/devices/platform':
KERNELS=="platform"
SUBSYSTEMS==""
DRIVERS==""
Any idea ?
Thanks!

Answer 1

This is driving me crazy...
At GRUB time the keyboard backlight goes on.
UDEV SCRIPT
/etc/udev/rules.d/kbd_backlight.rules
SUBSYSTEM=="leds", ACTION=="add", KERNEL=="asus::kbd_backlight",DRIVERS=="asus-nb-wmi", ATTR{brightness}="0"
=> turns it off later, more or less when the filesystem is loaded, but when gdm (login/passwd) starts it turns on again.
SYSTEMD SCRIPT
After some fight with systemd I could do a script (the tricky part was to start it at the good "level")
/etc/systemd/system/kbd_backlight_off.service
[Unit]
Description=Turns off the keyboard backlight
Requires=upower.service graphical.target network.target
After=upower.service graphical.target network.target
[Service]
Type=oneshot
RemainAfterExit=no
ExecStart= /usr/bin/dbus-send --type=method_call --system --dest=org.freedesktop.UPower /org/freedesktop/UPower/KbdBacklight org.freedesktop.UPower.KbdBacklight.SetBrightness "int32:0"
[Install]
WantedBy=graphical.target
=> useless, adds nothing to udev (standalone it has the same effect than the udev script)
DESKTOP AUTOSTART SCRIPT
.config/autostart/kbd_backlight_off.desktop
[Desktop Entry]
Type=Application
Exec=dbus-send --type=method_call --print-reply=literal --system --dest='org.freedesktop.UPower' '/org/freedesktop/UPower/KbdBacklight' 'org.freedesktop.UPower.KbdBacklight.SetBrightness' "int32:0"
Hidden=false
X-GNOME-Autostart-enabled=true
Name[en_US]=kbd_backlight_off
Name=kbd_backlight_off
Comment[en_US]=kbd_backlight_off
Comment=kbd_backlight_off
=> it turns if off after the login, but when the background wallpaper is displayed it goes on again...
Shouldn't be so difficult to turn the keyboard backlight off, from the boot time... What am I missing ???