It seems to work in 64-bit Ubuntu however doesn't work in 32-bit Ubuntu,
neither 12.04 nor 13.10. I made some investigation and found problem in
strtol function behaves differently on 32-bit and 64-bit systems.

For example:
64-bit strtol("fffffff0", &endptr, 16), result is 4294967280
32-bit strtol("fffffff0", &endptr, 16), result is 2147483647

Sources to check:
Ubuntu 12.04: udev-175/extras/keymap/keymap.c
Ubuntu 13.10: systemd-204/src/udev/udev-builtin-keyboard.c

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https://bugs.launchpad.net/bugs/1247676

Title:
  Plantronics .Audio 648 buttons doesn't in Ubuntu Saucy

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