Comment # 7 on bug 1160911 from
At best, try to dig your old kernel messages (via journal or messages) for the
working case, and compare with the broken case.

I'm not entirely sure whether it's a breakage in the kernel, though.  It might
be some changes in the user-space side (e.g. udev, which usually maps some
media keys via hwdb, see /usr/lib/udev/hwdb.d/*).  You can try evtest for
checking the raw input device events, too.


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