Testing the troubleshooting guide at
https://wiki.ubuntu.com/Hotkeys/Troubleshooting i note that xev does not
record a keypress for the hotkeys <Fn+F8> <Fn+F9>.

No xev keypress events are produced for some other keys too (switching
off the touchpad, bluetooth, wlan, switching monitors) but their
expected functions work nonetheless.

/lib/udev/findkeyboards 
returns "AT keyboard: input/event4"
 
sudo /lib/udev/keymap -i input/event4

causes a continuous stream of <return> to be sent to any selected
window. The function keys relative to this bug report produce no output
here either. Notably, disabling the wlan at this point (using its
function key) causes it to remain disabled in spite of trying to toggle
it back on.

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https://bugs.launchpad.net/bugs/1041116

Title:
  Brightness hotkeys have no effect on Clevo laptop

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