This issue is still present in Ubuntu 9.10, Karmic Koala. I have
implemented the following workaround on my system, which is a persistent
version of that in update 4 above.

i...@dash:~$ cat /etc/modprobe.d/asus-backlight-workaround.conf
# Got this from Ubuntu bug 222171.
install asus-laptop /sbin/modprobe --ignore-install asus-laptop; sleep 2; echo 
5 > /sys/devices/platform/asus_laptop/ls_level

This is a bug in the asus-laptop kernel module.

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[Hardy] Backlight low on Asus x57 laptop (M50sa)
https://bugs.launchpad.net/bugs/222171
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