Here is workaround for M50Sv and maybe other laptop controled by asus-laptop 
driver
 
This is compilation from http://bbs.archlinux.org/viewtopic.php?id=38935
Copy files from attached file to corresponding directories

Enables ASUS Light Sensor switching
/etc/acpi/events/asus-ctrl-a 
/etc/acpi/asus-ls-switch.sh

Brightness control scripts (working with ASUS Light Sensor enabled)
/etc/acpi/asus-brn-up.sh
/etc/acpi/asus-brn-down.sh

Script that saves settings for ASUS Light Sensor
/etc/init.d/asus-ls
/etc/asus-ls.conf

run
sudo update-rc.d asus-ls defaults

and
sudo /etc/init.d/acpid restart

If Brightness down key doesn't work
change first line of /etc/acpi/events/asus-brightness-down
to this
event=hotkey ATKD 0000002[0123456789abcdef]

Sorry for my English

** Attachment added: "asus-m50sv.tar.gz"
   http://launchpadlibrarian.net/14205697/asus-m50sv.tar.gz

-- 
Brightness Bug, not like all the others!
https://bugs.launchpad.net/bugs/224636
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