Patch based on

  From e0d856dd48d640f3d95efe7b769edec02373cc74 Mon Sep 17 00:00:00 2001
  From: Lennart Poettering <lennart@poettering.net>
  Date: Wed, 16 Oct 2013 02:51:24 +0200
  Subject: [PATCH] rules: don't limit some of the rules to the "add" action

  Devices should show up in systemd regardless whether the user invoked
  "udevadm trigger" or not. Before this change some devices might have
  suddenly disappeared due issuing that command.

and also on

  From 1a0464230c08506c3fd715ff7cc56660df3a85ca Mon Sep 17 00:00:00 2001
  From: Bastien Nocera <hadess@hadess.net>
  Date: Fri, 11 Oct 2013 07:45:32 +0000
  Subject: Add support for saving/restoring keyboard backlights

  Piggy-backing on the display backlight code, this saves and restores
  keyboard backlights on supported devices.

  The detection code matches that of UPower:
  http://cgit.freedesktop.org/upower/tree/src/up-kbd-backlight.c#n173

  https://bugs.freedesktop.org/show_bug.cgi?id=70367

  [tomegun: also work for devices named "{smc,samsung,asus}::kbd_backlight"]

---
 rules/99-systemd.rules.in |   10 ++++++----
 src/backlight/backlight.c |    7 +++++--
 2 files changed, 11 insertions(+), 6 deletions(-)

--- rules/99-systemd.rules.in
+++ rules/99-systemd.rules.in	2014-02-14 14:46:48.358235397 +0000
@@ -51,14 +51,16 @@ SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_dev
 
 ACTION=="add", SUBSYSTEM=="net", KERNEL!="lo", RUN+="@rootlibexecdir@/systemd-sysctl --prefix=/proc/sys/net/ipv4/conf/$name --prefix=/proc/sys/net/ipv4/neigh/$name --prefix=/proc/sys/net/ipv6/conf/$name --prefix=/proc/sys/net/ipv6/neigh/$name"
 
-# Pull in backlight save/restore for all firmware backlight devices
+# Pull in backlight save/restore for all backlight devices and
+# keyboard backlights
 
-ACTION=="add", SUBSYSTEM=="backlight", ATTR{type}=="firmware", TAG+="systemd", ENV{SYSTEMD_WANTS}+="systemd-backlight@$name.service"
+SUBSYSTEM=="backlight", TAG+="systemd", IMPORT{builtin}="path_id", ENV{SYSTEMD_WANTS}+="systemd-backlight@backlight:$name.service"
+SUBSYSTEM=="leds", KERNEL=="*kbd_backlight", TAG+="systemd", IMPORT{builtin}="path_id", ENV{SYSTEMD_WANTS}+="systemd-backlight@leds:$name.service"
 
 # Asynchronously mount file systems implemented by these modules as
 # soon as they are loaded.
 
-SUBSYSTEM=="module", KERNEL=="fuse", ACTION=="add", TAG+="systemd", ENV{SYSTEMD_WANTS}+="sys-fs-fuse-connections.mount"
-SUBSYSTEM=="module", KERNEL=="configfs", ACTION=="add", TAG+="systemd", ENV{SYSTEMD_WANTS}+="sys-kernel-config.mount"
+SUBSYSTEM=="module", KERNEL=="fuse", TAG+="systemd", ENV{SYSTEMD_WANTS}+="sys-fs-fuse-connections.mount"
+SUBSYSTEM=="module", KERNEL=="configfs", TAG+="systemd", ENV{SYSTEMD_WANTS}+="sys-kernel-config.mount"
 
 LABEL="systemd_end"
--- src/backlight/backlight.c
+++ src/backlight/backlight.c	2014-02-14 15:20:47.534298128 +0000
@@ -56,9 +56,11 @@ int main(int argc, char *argv[]) {
 
         errno = 0;
         device = udev_device_new_from_subsystem_sysname(udev, "backlight", argv[2]);
+        if (!device)
+                device = udev_device_new_from_subsystem_sysname(udev, "leds", argv[2]);
         if (!device) {
                 if (errno != 0) {
-                        log_error("Failed to get backlight device: %m");
+                        log_error("Failed to get backlight device '%s': %m", argv[2]);
                         r = -errno;
                 } else
                         r = log_oom();
@@ -66,7 +68,8 @@ int main(int argc, char *argv[]) {
                 goto finish;
         }
 
-        if (!streq_ptr(udev_device_get_subsystem(device), "backlight")) {
+        if (!streq_ptr(udev_device_get_subsystem(device), "backlight") &&
+            !streq_ptr(udev_device_get_subsystem(device), "leds")) {
                 log_error("Not a backlight device: %s", argv[2]);
                 r = -ENODEV;
                 goto finish;