Sometimes keyboard backlight not working

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https://bbs.archlinux.org – Hi,I sometimes get a problem with my Asus Zenbook Ux32vd. About half of the times when I boot my system the keyboard backlight goes out while booting my Arch system. This coincides with the xfce-powermanager not displaying the normal animations when changing the display brightness (changing the brightness itself and everything else works fine). When I try to change the keyboard backlight brightness manually via the asus-kbd-backlight command (installed form AUR) I get the following error% asus-kbd-backlight cat: /sys/devices/platform/asus-nb-wmi/leds/asus::kbd_backlight/max_brightness: No suc (HowTos)