Keyboard backlight on Asus FX502VM

Neraeh · 2017-02-21 15:01:12

Hello,

I'm currently finalizing my Arch setup on my brand new laptop
I already faced some issues (such as the screen brightness control) but I managed to fix a great part of them
Right now, my laptop has a black keyboard with red backlight to see what you are typing, but I can't see anything in the dark when the backlight is off
I'd want to find a way to turn on and off this backlight with a script or a single command

I already searched on the wiki ( https://wiki.archlinux.org/index.php/Keyboard_backlight ), and the provided script crashes :

Traceback (most recent call last):
  File "/usr/local/bin/kb-light.py", line 28, in <module>
    print(kb_light_set(1))
  File "/usr/local/bin/kb-light.py", line 13, in kb_light_set
    current = kbd_backlight.GetBrightness()
  File "/usr/lib/python3.6/site-packages/dbus/proxies.py", line 70, in __call__
    return self._proxy_method(*args, **keywords)
  File "/usr/lib/python3.6/site-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python3.6/site-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.UnknownMethod: L'interface « org.freedesktop.UPower.KbdBacklight » n'existe pas pour l'objet à l'emplacement /org/freedesktop/UPower/KbdBacklight

I looked in /sys/class/leds and got this

asus-wireless::airplane  input0::scrolllock  input11::kana        phy0-led
input0::capslock         input11::capslock   input11::numlock
input0::numlock          input11::compose    input11::scrolllock

(I already tried to change the brightness of phy0-led, but it was not what I was looking for)

Right now, I don't have any idea where to look for
Can someone try to help me please ?

EDIT: I have a dual boot with Windows, when I boot into Windows, the backlight turns on, and if I reboot immediatly into Arch, it stays on. Is it BIOS related ?

Last edited by Neraeh (2017-02-21 15:02:35)

ewaller · 2017-02-21 15:44:59

Let us take a different tack. What is the output of ls -l /sys/class/leds ?

Edit: Oh, Welcome to the Arch Linux Forums.

Edit: Ack! Did I miss that you had posted that already, or had you edited that part?

Last edited by ewaller (2017-02-21 15:46:22)

Neraeh · 2017-02-21 15:53:34

ewaller wrote:

Let us take a different tack. What is the output of ls -l /sys/class/leds ?

Here it is:

$ ls -l /sys/class/leds
total 0
lrwxrwxrwx 1 root root 0 21 févr. 16:42 asus-wireless::airplane -> ../../devices/LNXSYSTM:00/LNXSYBUS:00/ATK4002:00/leds/asus-wireless::airplane
lrwxrwxrwx 1 root root 0 21 févr. 16:42 input0::capslock -> ../../devices/platform/i8042/serio0/input/input0/input0::capslock
lrwxrwxrwx 1 root root 0 21 févr. 16:42 input0::numlock -> ../../devices/platform/i8042/serio0/input/input0/input0::numlock
lrwxrwxrwx 1 root root 0 21 févr. 16:42 input0::scrolllock -> ../../devices/platform/i8042/serio0/input/input0/input0::scrolllock
lrwxrwxrwx 1 root root 0 21 févr. 16:42 input1::capslock -> ../../devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/0003:0B05:1837.0001/input/input1/input1::capslock
lrwxrwxrwx 1 root root 0 21 févr. 16:42 input1::compose -> ../../devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/0003:0B05:1837.0001/input/input1/input1::compose
lrwxrwxrwx 1 root root 0 21 févr. 16:42 input1::kana -> ../../devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/0003:0B05:1837.0001/input/input1/input1::kana
lrwxrwxrwx 1 root root 0 21 févr. 16:42 input1::numlock -> ../../devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/0003:0B05:1837.0001/input/input1/input1::numlock
lrwxrwxrwx 1 root root 0 21 févr. 16:42 input1::scrolllock -> ../../devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/0003:0B05:1837.0001/input/input1/input1::scrolllock
lrwxrwxrwx 1 root root 0 21 févr. 16:42 phy0-led -> ../../devices/pci0000:00/0000:00:1c.2/0000:03:00.0/leds/phy0-led

ewaller wrote:

Edit: Oh, Welcome to the Arch Linux Forums.
Edit: Ack! Did I miss that you had posted that already, or had you edited that part?

Thank you
I'm a long time Arch user, but I never had to come here to ask for help until now ^^
Nope, was already there, but without the -l arg

tomasnovoselic · 2017-04-03 17:11:30

Hi everyone,

I have the same laptop and same issue.

[tomas@morpheus ~]$ uname -r
4.10.6-1-ARCH

[tomas@morpheus ~]$ sudo lsmod |grep asus
asus_nb_wmi            28672  0
asus_wmi               24576  1 asus_nb_wmi
sparse_keymap          16384  1 asus_wmi
rfkill                 20480  6 asus_wmi,bluetooth,cfg80211
video                  36864  1 asus_wmi
wmi                    16384  2 asus_wmi,mxm_wmi
asus_wireless          16384  0
led_class              16384  3 asus_wmi,input_leds,asus_wireless
i8042                  24576  1 asus_nb_wmi

[tomas@morpheus ~]$ ls -l /sys/class/leds
total 0
drwxr-xr-x  2 root root 0 Apr  3 16:00 .
drwxr-xr-x 51 root root 0 Apr  3 15:57 ..
lrwxrwxrwx  1 root root 0 Apr  3 16:00 asus-wireless::airplane -> ../../devices/LNXSYSTM:00/LNXSYBUS:00/ATK4002:00/leds/asus-wireless::airplane
lrwxrwxrwx  1 root root 0 Apr  3 16:00 input0::capslock -> ../../devices/platform/i8042/serio0/input/input0/input0::capslock
lrwxrwxrwx  1 root root 0 Apr  3 16:00 input0::numlock -> ../../devices/platform/i8042/serio0/input/input0/input0::numlock
lrwxrwxrwx  1 root root 0 Apr  3 16:00 input0::scrolllock -> ../../devices/platform/i8042/serio0/input/input0/input0::scrolllock
lrwxrwxrwx  1 root root 0 Apr  3 16:00 input2::capslock -> ../../devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/0003:0B05:1837.0002/input/input2/input2::capslock
lrwxrwxrwx  1 root root 0 Apr  3 16:00 input2::compose -> ../../devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/0003:0B05:1837.0002/input/input2/input2::compose
lrwxrwxrwx  1 root root 0 Apr  3 16:00 input2::kana -> ../../devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/0003:0B05:1837.0002/input/input2/input2::kana
lrwxrwxrwx  1 root root 0 Apr  3 16:00 input2::numlock -> ../../devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/0003:0B05:1837.0002/input/input2/input2::numlock
lrwxrwxrwx  1 root root 0 Apr  3 16:00 input2::scrolllock -> ../../devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/0003:0B05:1837.0002/input/input2/input2::scrolllock

Is there anything that I can try?

I also tried to modify kernel boot parameters (acpi_osi & acpi_backlight), but no luck

ironLink21 · 2017-04-08 05:58:37

ya I have the same issue on ASUS ROG GL702VM. I find it very odd that there is no kbd_backlight under the /sys/class/leds.

I've also tried the acpi_ios=<space>, acpi_ios="!Window 2012", acpi_ios=linux... in the /etc/mkinitcpio.conf with no luck.

I've tried installing the kbd_backlight module for asus https://aur.archlinux.org/packages/asus-kbd-backlight/ --- have you tried that?

when I run xev I don't get any output for Fn+F3/4. Do you guys get any output under xev?

The only time I've been able to get the keyboard backlight to be on is if I boot into windows and turn it on, then reboot into Arch and it stays on at full brightness until you reboot again.

I've also look for backlight in /sys/devices with the following output.

find /sys/devices -name '*backlight*'                                                                  [23:56:33]
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight

which is what the screen brightness uses.

I've also not be able to get the Fn+F5/6 (keys for screen brightness) I'm not able to get any output from xev for those buttons but if I remap the keys to say ctrl+F5/6 I can adjust the backlight (don't know if you guys have that problem)

Last edited by ironLink21 (2017-04-08 05:59:29)

Arch Linux

#1 2017-02-21 15:01:12

Keyboard backlight on Asus FX502VM

#2 2017-02-21 15:44:59

Re: Keyboard backlight on Asus FX502VM

#3 2017-02-21 15:53:34

Re: Keyboard backlight on Asus FX502VM

#4 2017-04-03 17:11:30

Re: Keyboard backlight on Asus FX502VM

#5 2017-04-08 05:58:37

Re: Keyboard backlight on Asus FX502VM

Board footer