it is HW issue ,i guess your modem is under uncorrect state,i met similiar problem a few days ago!
please check you use AT port or PPP network dial port ,or you need "ATH" after the first time exit to let modem RESET! 2009/11/6 Herman <hermanmao...@gmail.com> > Hi Eric, > > I have already chosen that. But it has the same result. > > Br, > Herman > > 2009/11/5 Eric.Wang <ack0...@gmail.com> > > confirm your kernel menuconfig and try again >> (*) PPP support for async serial ports >> (*) PPP support for sync tty ports >> >> On Oct 21, 4:44 pm, Herman <hermanmao...@gmail.com> wrote: >> > Hi all, >> > >> > I try to enable data connection function through external modem. It can >> dial >> > but data connection failed. PPPD can't work well. In PPP daemon, it >> showed >> > "Couldn't set tty to PPP discipline: m". I used 2.6.26 kernel before, >> but >> > now I used 2.6.29 kernel. In kernel configuration, I have already >> enabled >> > "Device Drivers->Network device support->PPP support". They have same >> result >> > in io control "TIOCSETD", it seems that it can't set to data discipline. >> I >> > use USB to Serial converter interface, below is log of radio and pppd. >> Does >> > anyone have suggestions? Thanks. >> > >> > D/AT ( 606): AT> ATD*99***1# >> > D/AT ( 606): AT< ATD*99***1# >> > D/AT ( 606): AT< CONNECT 115200 >> > D/RILJ ( 662): [0041]< SETUP_DEFAULT_PDP {1, ppp0} >> > D/GSM ( 662): [PdpConnection] PDP setup on cid = 1 >> > I/pppd ( 806): Starting pppd >> > E/pppd ( 807): Couldn't set tty to PPP discipline: m >> > D/AT ( 606): AT< ~ }# !}!}!} }<}!}$}% }"}&} } } } }%}&} } } >> }}'}"}(}"}#}$ # U~ >> > >> > D/AT ( 606): AT< OK >> > I/pppd ( 812): pppd exited with 1 >> > I/pppd ( 816): Starting pppd >> > E/pppd ( 817): Couldn't set tty to PPP discipline: m >> > I/pppd ( 820): pppd exited with 1 >> > I/pppd ( 824): Starting pppd >> > E/pppd ( 825): Couldn't set tty to PPP discipline: m >> > I/pppd ( 828): pppd exited with 1 >> > I/pppd ( 832): Starting pppd >> > E/pppd ( 833): Couldn't set tty to PPP discipline: m >> > I/pppd ( 836): pppd exited with 1 >> > >> > Best regards, >> > Herman >> >> -- >> unsubscribe: >> android-porting+unsubscr...@googlegroups.com<android-porting%2bunsubscr...@googlegroups.com> >> website: http://groups.google.com/group/android-porting > > > -- > unsubscribe: > android-porting+unsubscr...@googlegroups.com<android-porting%2bunsubscr...@googlegroups.com> > website: http://groups.google.com/group/android-porting > -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting