FYI, Andy's test kernels work for me (Panasonic Toughbook CF-19), but I
have this other problem where at times the screen just starts getting
dimmer and dimmer, and the bright/dim keys (or direct writes to
/sys/class/backlight/panasonic/... files), but then suddenly after a
minute or so it will suddenly start working again and recognize that the
backlight is dim or off and allow me to turn it back up.

I didn't see this under hardy at all (where I used pcc_acpi), it showed
up when I moved to intrepid, even before moving to these test kernels
(when I couldn't adjust brightness at all -- it would just get dimmer
and brighter on its own, very frustrating).  At least now I can fix it
some of the time.

There are also issues where the UI (GNOME) doesn't seem to recognize the
full range of the backlight, which goes from 0 to 21; using the
bright/dim keys, I can only get it up to 9 or so.  Writing directly to
the files I can up it to the full 21 (in its full outdoor-readable
battery-draining glory).

-- 
Support for panasonic hotkeys missing
https://bugs.launchpad.net/bugs/222324
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