> hotplug + firmware.agent + /usr/lib/hotplug/firmware/isl3690
You mean isl3890 right?
        v2.4
        CONFIG_EXPERIMENTAL: y
                Code maturity level options  --->
                         Prompt for development and/or incomplete code/drivers
        CONFIG_FW_LOADER: (m or y)
                Library routines  --->
                        Hotplug firmware loading support (EXPERIMENTAL)