following 
https://wiki.ubuntu.com/LaptopTestingTeam/HotkeyResearch

please note the following additional info (which I hope could help):
(from tty after 
sudo /etc/init.d/hotkey-setup stop
sudo showkey -u | tee -a hotkey-log.txt
fn-f4 produces)
0xe0 0x56 0xe0 0xd6

sudo dmidecode -s system-manufacturer
Hewlett-Packard

sudo dmidecode -s system-product-name
pavilion ze2000(ps731ea#abt)      

sudo dmidecode -s system-version
Rev 1

-- 
system crash upon FN-F4 press
https://bugs.launchpad.net/bugs/159916
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