This probably requires loading the 'acerhk' module for your laptop. Can you please include the DMI data as shown in the HotkeyResearch wiki page and test whether:
sudo modprobe acerhk
makes any difference to whether you get keycodes?
** Changed in: hotkey-setup (Ubuntu)
Status: Unconfirmed => Needs Info
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No events from Acer TravelMate 650 extra buttons
https://launchpad.net/bugs/60322
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