Ubuntu
udev package

  1. Bug #543036
  2. Comment #7

Comment 7 for bug 543036

Revision history for this message
Keng-Yu Lin (lexical) wrote : Re: Lenovo Y550 - monitor settings and wireless settings buttons not work

Two tests you can proceed:
  1. kill acpid and run `acpi_listen`. see if any ACPI event when you press the keys.
  2. `sudo /lib/udev/keymap -i input/eventX`. X is number, check `ls /dev/input/` for all the events. see if any scancode shows up when pressing the keys.