The DSDT describes a FUNC interface that exposes currently unused
functionality. This patch adds 3 read-only files to the platform device
containing docked, lid & radio state.

Please test whether this returns appropriate information on your
specific laptop. Also, please enable debugging and supply me with:
- your exact laptop type (such as Lifebook S6420)
- the icons on your 4 application panel buttons
- your BTNI value (such as 0xff0101)
- your LEDI value (such as 0x100)
- your DSDT, available from /sys/firmware/acpi/tables/DSDT

Regards,
Tony V.

P.S. Apologies if you got a duplicate message, the mail didn't seem to
have made it out to linux-acpi after 6 hours.