Not sure if the check should be exactly here but I was tired of searching why my device wasn't working at all until I found I needed to enable CONFIG_USB_SERIAL Thanks a lot Reproducible: Always
*usb_modeswitch-1.2.3 (15 Mar 2012) 15 Mar 2012; Samuli Suominen <ssuominen@gentoo.org> +usb_modeswitch-1.2.3.ebuild: Version bump wrt #407237 and display a warning if CONFIG_USB_SERIAL is unset #407241 by Pacho Ramos. Use /lib/udev instead of /$(get_libdir)/udev and yes, this is really correct. Install ChangeLog and README.