modem, serial port & laptop

Frank Shute frank at
Mon Dec 9 06:17:25 GMT 2002

Trying to get my Thinkpad 240 going with 4.6 RELEASE but have run into
a problem with the serial port. When I try to fire up ppp the machine
hangs solidly. I haven't got a lot of diagnostic info but:

$ dmesg -a | grep irq

ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
uhci0: <Intel 82371AB/EB (PIIX4) USB controller> port 0x1060-0x107f irq 11 at device 7.2 on pci0
pcic0: <TI PCI-1211 PCI-CardBus Bridge> irq 11 at device 10.0 on pci0
pcic0: TI12XX PCI Config Reg: [ring enable][speaker enable][pwr save][CSC serial isa irq]
pci0: <unknown card> (vendor=0x125d, dev=0x1969) at 11.0 irq 5
pci0: <unknown card> (vendor=0x11c1, dev=0x0449) at 12.0 irq 11
fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
sio0: configured irq 4 not in bitmap of probed irqs 0
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 8250


<snipped from kernel config>

# PCCARD (PCMCIA) support
device          card
device          pcic0   at isa? port 0x3e0 flags 0x1 iomem 0xd0000 irq 11
#device         pcic1   at isa? irq 0 port 0x3e2 iomem 0xd4000 disable

# Serial (COM) ports
device          sio0    at isa? port IO_COM1 flags 0x10 irq 4


# stty -a -f /dev/cuaa0

speed 9600 baud; 0 rows; 0 columns;
lflags: -icanon -isig -iexten -echo -echoe -echok -echoke -echonl
        -echoctl -echoprt -altwerase -noflsh -tostop -flusho -pendin
        -nokerninfo -extproc
iflags: -istrip -icrnl -inlcr -igncr -ixon -ixoff -ixany -imaxbel -ignbrk
        -brkint -inpck -ignpar -parmrk
oflags: -opost -onlcr -ocrnl -oxtabs -onocr -onlret
cflags: cread cs8 -parenb -parodd hupcl -clocal -cstopb -crtscts -dsrflow
        -dtrflow -mdmbuf
cchars: discard = ^O; dsusp = ^Y; eof = ^D; eol = <undef>;
        eol2 = <undef>; erase = ^?; erase2 = ^H; intr = ^C; kill = ^U;
        lnext = ^V; min = 1; quit = ^\; reprint = ^R; start = ^Q;
        status = ^T; stop = ^S; susp = ^Z; time = 0; werase = ^W;


I think it's an irq conflict but not too sure.

Any ideas on how to go about fixing this up? BTW, PCMCIA works OK as
does APM. It has got a Lucent internal modem but I think there's only
a linux driver available for it....which may or may not work with




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