Since lk 4.0.0 came out running ppp connected to a serial port (GPRS) has failed on my hardware (at91sam9g25 based ARM system). It works in lk 3.19-rc4 which is the last kernel I tried prior to lk 4.0.0 . The fix to ppp_generic.c in lk 4.0.2 did not help. With older kernels I see: ... chat[1760]: ATD*99***1#^M^M chat[1760]: CONNECT chat[1760]: -- got it chat[1760]: send (^M) pppd[1758]: Serial connection established. pppd[1758]: Using interface ppp0 ... and about 5 ppp related modules loaded including ppp_async. With lk 4.0.x the "Serial connection established" line never appears and only the ppp_generic module is loaded. I get the same results (i.e. depends on the kernel version) with both an up to date Debian 7 (wheezy) and a freshly minted Debian 8 (jessie) system. Doug Gilbert -- To unsubscribe from this list: send the line "unsubscribe linux-ppp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html