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bash:~$ cat /proc/acpi/ibm/hotkey
status: enabled
mask: 0x008c7fff
commands: enable, disable, reset, <mask>
0x008c7fff means that in the mask there are only certain buttons.
Change the mask to 0x00ffffff and volume works fine (must be root).
echo 0x00ffffff >/proc/acpi/ibm/hotkey