Comment 1 for bug 590607

 SRU Justification:

    Impact:
    A type of Dell Inspiron Mini does not turn off bluetooth physically when
    pressing F2 (rfkill hotkey).

    Fix:
    Current kernel code expects hardware to handle the hard-rfkill switching
    spontaneously and only notify rfkill subsystem with the status change.
    This patch makes kernel to explicitly fire a SMI to switch on/off
    rfkill devices if BIOS reports that the hardware switch is not supported.

    This patch depends on the following sauce patch in lucid kernel so is not going upstream:
            UBUNTU: SAUCE: dell-laptop: Store the HW switch status internally rather than requerying every time

    Testcase:
    I tested the patch on a Dell Mini 10. It works smoothly.