[gentoo-user] keyboard lighting control?

[Mark Knecht]

Is there either a kernel config option or additionally some
application that allows me to turn on and off the lights underneath
this groovy new laptop's keyboard?

They flash on when booting, and work in Windows, but I don't know how
to control them in Linux. I haven't found any function key that does
it in hardware so I assume it's possibly an ACPI type thing or
something else?

Thanks,
Mark