Hi, same problem here, keyboard backlight and some Fn don't work:
- F5 (fan overboost, that's ok if it doesn't work)
- F6 (don't know what it is)
- F7 (screen brightness down)
- F8 (screen brightness up)
- F10 (disable touchpad)
- F11 (screen sleep)
- F12 (airplane mode)
- keyboard arrow up (brightness keyboard light up)
- keyboard arrow down (brightness keyboard light down)

And also some shortcut buttons above F1-F4:
- disable mic button
- rog button (it's ok if it doesn't work, but if works we can change it to 
something?)

Here is my system:
# dmesg | grep -i asus | head -1 
[    0.000000] DMI: ASUSTeK COMPUTER INC. Zephyrus M GM501GS/GM501GS, BIOS 
GM501GS.310 04/22/2019

# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.2 LTS
Release:        18.04
Codename:       bionic

# uname -r
4.18.0-21-generic

# ls -l /sys/class/leds 
total 0
lrwxrwxrwx 1 root root 0 Jun 17 13:21 asus::lightbar -> 
../../devices/platform/asus-nb-wmi/leds/asus::lightbar
lrwxrwxrwx 1 root root 0 Jun 17 13:21 asus-wireless::airplane -> 
../../devices/LNXSYSTM:00/LNXSYBUS:00/ATK4002:00/leds/asus-wireless::airplane
lrwxrwxrwx 1 root root 0 Jun 17 13:21 input13::capslock -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/0003:0B05:1866.0003/input/input13/input13::capslock
lrwxrwxrwx 1 root root 0 Jun 17 13:21 input13::compose -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/0003:0B05:1866.0003/input/input13/input13::compose
lrwxrwxrwx 1 root root 0 Jun 17 13:21 input13::kana -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/0003:0B05:1866.0003/input/input13/input13::kana
lrwxrwxrwx 1 root root 0 Jun 17 13:21 input13::numlock -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/0003:0B05:1866.0003/input/input13/input13::numlock
lrwxrwxrwx 1 root root 0 Jun 17 13:21 input13::scrolllock -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/0003:0B05:1866.0003/input/input13/input13::scrolllock
lrwxrwxrwx 1 root root 0 Jun 17 13:21 input14::capslock -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.1/0003:0B05:1866.0004/input/input14/input14::capslock
lrwxrwxrwx 1 root root 0 Jun 17 13:21 input14::compose -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.1/0003:0B05:1866.0004/input/input14/input14::compose
lrwxrwxrwx 1 root root 0 Jun 17 13:21 input14::kana -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.1/0003:0B05:1866.0004/input/input14/input14::kana
lrwxrwxrwx 1 root root 0 Jun 17 13:21 input14::numlock -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.1/0003:0B05:1866.0004/input/input14/input14::numlock
lrwxrwxrwx 1 root root 0 Jun 17 13:21 input14::scrolllock -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.1/0003:0B05:1866.0004/input/input14/input14::scrolllock
lrwxrwxrwx 1 root root 0 Jun 17 13:21 input4::capslock -> 
../../devices/platform/i8042/serio0/input/input4/input4::capslock
lrwxrwxrwx 1 root root 0 Jun 17 13:21 input4::numlock -> 
../../devices/platform/i8042/serio0/input/input4/input4::numlock
lrwxrwxrwx 1 root root 0 Jun 17 13:21 input4::scrolllock -> 
../../devices/platform/i8042/serio0/input/input4/input4::scrolllock
lrwxrwxrwx 1 root root 0 Jun 17 13:21 phy0-led -> 
../../devices/pci0000:00/0000:00:14.3/leds/phy0-led

# cat /etc/default/grub | grep CMDLINE
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nvidia-drm.modeset=1 
acpi_backlight=native"
GRUB_CMDLINE_LINUX=""

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https://bugs.launchpad.net/bugs/1802652

Title:
  keyboard backlight not working on Asus GM501

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  The keyboard lights and most of the F keys aren't working.
  Kernel = 4.15.0-20-generic
  System linux mint 19

  ls -hal /sys/class/leds/
  total 0
  drwxr-xr-x  2 root root 0 Nov 10 15:47 .
  drwxr-xr-x 72 root root 0 Nov 10 15:43 ..
  lrwxrwxrwx  1 root root 0 Nov 10 15:43 asus::lightbar -> 
../../devices/platform/asus-nb-wmi/leds/asus::lightbar
  lrwxrwxrwx  1 root root 0 Nov 10 15:47 asus-wireless::airplane -> 
../../devices/LNXSYSTM:00/LNXSYBUS:00/ATK4002:00/leds/asus-wireless::airplane
  lrwxrwxrwx  1 root root 0 Nov 10 15:47 input4::capslock -> 
../../devices/platform/i8042/serio0/input/input4/input4::capslock
  lrwxrwxrwx  1 root root 0 Nov 10 15:47 input4::numlock -> 
../../devices/platform/i8042/serio0/input/input4/input4::numlock
  lrwxrwxrwx  1 root root 0 Nov 10 15:47 input4::scrolllock -> 
../../devices/platform/i8042/serio0/input/input4/input4::scrolllock
  lrwxrwxrwx  1 root root 0 Nov 10 15:47 input7::capslock -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/0003:0B05:1866.0001/input/input7/input7::capslock
  lrwxrwxrwx  1 root root 0 Nov 10 15:47 input7::compose -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/0003:0B05:1866.0001/input/input7/input7::compose
  lrwxrwxrwx  1 root root 0 Nov 10 15:47 input7::kana -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/0003:0B05:1866.0001/input/input7/input7::kana
  lrwxrwxrwx  1 root root 0 Nov 10 15:47 input7::numlock -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/0003:0B05:1866.0001/input/input7/input7::numlock
  lrwxrwxrwx  1 root root 0 Nov 10 15:47 input7::scrolllock -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/0003:0B05:1866.0001/input/input7/input7::scrolllock
  lrwxrwxrwx  1 root root 0 Nov 10 15:47 input8::capslock -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.1/0003:0B05:1866.0002/input/input8/input8::capslock
  lrwxrwxrwx  1 root root 0 Nov 10 15:47 input8::compose -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.1/0003:0B05:1866.0002/input/input8/input8::compose
  lrwxrwxrwx  1 root root 0 Nov 10 15:47 input8::kana -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.1/0003:0B05:1866.0002/input/input8/input8::kana
  lrwxrwxrwx  1 root root 0 Nov 10 15:47 input8::numlock -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.1/0003:0B05:1866.0002/input/input8/input8::numlock
  lrwxrwxrwx  1 root root 0 Nov 10 15:47 input8::scrolllock -> 
../../devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.1/0003:0B05:1866.0002/input/input8/input8::scrolllock
  lrwxrwxrwx  1 root root 0 Nov 10 15:47 phy0-led -> 
../../devices/pci0000:00/0000:00:14.3/leds/phy0-led

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