I am currently using the system76 Z35Fm and I find that the Fn+F5
(Brightness Minus - Dark Sun) and Fn+F6 (Brightness Plus - Bright Sun).

I was looking for the keycode for these two combinations. 
I have followed the wiki - 
https://wiki.ubuntu.com/LaptopTestingTeam/HotkeyResearch to find out what the 
ErrorLevel/KeyCode was for these two combinations. 

====
Result 
====

Method 1:
The Keyboard shortcuts do not produce any response to the combinations.

Method 2:
Through the terminal screen, I tried running the "showkey" command and ended up 
getting 0x9c (return key release) for both combinations.

Method 3:
Since I am unable to get a keycode I tried going low level and getting an APCI 
event generated from these combinations. Using the "tail" command, I got 
frustrated from the lack of response I got. I'm guessing that the even was not 
received by the kernel.

Laptop Identification:
ASUSTeK Computer Inc.        
Z35FM               
1.0       

By asking around I found that this may be caused by a buggy DSDT file (which 
may need to be manually configured for this machine). I wanted to check if 
there was an update to DSDT from system76, so I checked the knowledge76.com 
wiki and found that the system76 driver is not installed on this particular 
machine (recognizable by looking for System>Administration>System76*).
 
See:
http://knowledge76.com/index.php/System76_Driver
http://knowledge76.com/index.php/Restoring_Your_System

Will try downloading and installing 
http://planet76.com/repositories/system76-driver-2.1.1.deb
Will report with changes.

-- 
Brightness buttons don't work on System76 Z35F
https://bugs.launchpad.net/bugs/131672
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Bugs, which is the bug contact for Ubuntu.

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