Chris: the acpi_listen might work for testing if a key responds at all
(or is triggered by ACPI calls), but only passes through codes that the
sony-laptop driver actually generates. Therefore you might not see
anything at all.

Others:
1) If you do not see any any output from 'acpi_listen' and you are having one 
of the newer Sony laptop models (e.g. bought within the last nine months or 
so): the sony-laptop driver is going to be adjusted for this (so: wait a short 
while).
2) If you do see 'acpi_listen' output, you should also see somekind of output 
of 'showkey'
3) It might be that even though you see 'showkey' output your keys will not 
produce output in X environment (e.g. with xev or somesuch). That is a kernel 
-> X mapping issue. You can help here by adding entries to hal-quirks for your 
specific laptop model I believe.

Update: a fix for this for at least the SR series will be incorporated
into the kernel (in a short while). A more permanent fix (so that we
will not need to test and adjust code for each new Sony laptop model) is
being considered.

-- 
Fn keys on VAIO don't produce keystrokes nor ACPI events
https://bugs.launchpad.net/bugs/251665
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