Extra 'media' buttons on Toshiba A100

[Mike.lifeguard]

Yes, I tried xev - no output at all for these extra media buttons - same
for the Fn key (I just realized).

On a somewhat related note, my keyboard layout seems kinda messed up. In
terminal (only), pressing PgDn gives me a tilde. The tilde key does that
too, which is expected - not so for the PgDn key (I'd expect no output,
just like PgUp).

Finally, my left alt key doesn't do anything, so I suspect my keyboard
layout is incorrect. Of course, the exact one isn't listed (only one
Toshiba keyboard is listed) - so I chose general ACPI Standard, which
works for everything else. Just that one key doesn't work. Is there a
way to create a custom keyboard layout & share it (so ubuntu will
recognize they keyboard properly from installation for others)? Or is
there a package that has more keyboard layouts or something like that
I've missed? FWIW, that alt key is recognized in xev (as
"ISO_Level3_Shift").

Cheers,
-Mike
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