And /sys/class/backlight is empty.

I tried to modprobe all backlight modules:

dpkg-query -L linux-image-extra-3.11.0-12-generic|grep backlight\/|sed 
's/.*\///; s/\.ko//' > /tmp/1
for i in `cat /tmp/1`; do sudo modprobe $i; done

but /sys/class/backlight is still empty.

I also tried the xbacklight utility, it has no effect.

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https://bugs.launchpad.net/bugs/1239346

Title:
  Acer TravelMate P273 SMB Fn keys not working

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