Ok, so the problem persist with current Hardy and acpi version 0.09-3ubuntu1.
Further investigation revealed the following.
1. Kernel module asus-laptop recognizes F5N model correctly (from dmesg output: 
asus-laptop:   F5N model detected)
3. All special keys generate correct ACPI events (from cat /proc/acpi/event 
output)
2. /sys/class/leds directory is empy, making it impossible to control LEDs (all 
are LEDs are constantly on)
3. acpid works but acpi_fakekey now fails to generate keycodes with certain 
numbers. For instance, acpi_fakekey $KEY_WWW (defined in  
/usr/share/acpi-support/key-constants file) does not generate any key code with 
asus-laptop kernel module loaded (but will do it just fine with asus-acpi 
kernel module). It is a mystery to me because acpi-fakekey should be an 
independent program. And it is totally unclear what key code acpi_fakekey will 
generate from its argument.

Suggestions:

1. Replace acpi_fakekey with a program (lets call it fakekey) that simply 
generates key press / key release events with the key code given as its 
argument.
2. Use asus_acpid daemon to handle application keys, since GNOME does not have 
the capability to launch arbitrary application anyways (while it should allow 
to chose "Custom" to associate with a key in its System->Settings->Keyboard 
shortcuts dialogue).

In case of using asus_acpi daemon, there may be a need to install
correct key map based on laptop model detected. I am attaching the one
for Asus F5N model. It enables application keys as follows:

Media button - can be configured with GNOME keyboard shortcuts (it's just that 
acpi-fakekey generates wrong keycode for this one)
Asus4Power - gnome-terminal
Internet - default web browser
Asus Life Frame - either cheese or camorama (should be put in package 
dependencies so that webcam application gets installed on a laptop that has web 
camera built-in)
Asus Splendid Utility - nVidia profiles (requires nvidia-glx-new package to be 
installed)
Asus Power4Phone - Ekiga

Other keys are working out of the box with regular acpid daemon and therefore 
need not to be configured.
Attached is the set of configuration files that work fine with asus_acpid v0.41 
available from http://acpi4asus.sourceforge.net/
Some settings like running asus_acpid at session startup can be installed 
system wide to automatically apply to all users.

Now the most critical issue here is the empty /sys/class/leds directory,
something I cannot fix myself. Any ideas what is wrong there?

** Attachment added: "Making Asus F5N keys work with asus_acpid daemon"
   http://launchpadlibrarian.net/12620849/user_home_asus_acpi.tgz

-- 
Asus F5N laptop Special keys not working with asus-laptop kernel module
https://bugs.launchpad.net/bugs/199682
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