The keyboard mapping for Insprion 8xxx laptops seems bogus, the keycodes listed
are according to the xfree86 keycode file some keycodes only found on Japanese
keyboards, so at best the listing is janpanese keyboard specific.
On a 'normal' UK English laptop (Inspiron 8600) the correct keycodes are
included in the patch to inet attached. The current bindings should either be
removed or renamed to 'Inspiron 8xxx Japanese'
Created attachment 4452 [details]
Patch for updating Dell Inspiron multimedia keys mapping
Christian, could you please have a look at 'inspiron' in xkeyboard-config (CVS).
It seems it is current actually superset of both japanese and UK models - so
should work in both cases.