This notebook have a broken DSDT table, as result Fn+F6 button does not
work at all. There are two possible solution for a problem:

* ping ASUS for bugfix (i post a bug, but get "Linux is not supported")
* fix DSDT table manually according to this post, then patch your kernel to 
support DSDT loading from initramfs. Build and install modified kernel, then 
put modified DSDT to initramfs.

The fixed DSDT table can downloaded from ACPI site.

http://acpi.sourceforge.net/dsdt/view.php?id=893

A hierarchical tree structure in OS-controlled memory that contains named 
objects. These objects may
be data objects, control method objects, bus/device package objects, and so on. 
The OS dynamically
changes the contents of the namespace at run-time by loading and/or unloading 
definition blocks from
the ACPI Tables that reside in the ACPI BIOS. All the information in the ACPI 
Namespace comes
from the Differentiated System Description Table (DSDT), which contains the 
Differentiated
Definition Block, and one or more other definition blocks.

-- 
Fn+F2 on Asus A8Js isn't working
https://bugs.launchpad.net/bugs/105929
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Bugs, which is the bug contact for Ubuntu.

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