linux下gprs拨号时出现的问题！！

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我在debian上用wvdial拨号，硬件是深圳百亿公司的USB EDGE无线上网卡，型号是BAIYI-181V。用wvdial拨号时的提示如下：
debian:/home/root/wvdial# wvdial
--> WvDial: Internet dialer version 1.60
--> Cannot get information for serial port.
--> Initializing modem.
--> Sending: AT+CGDCONT=1,"IP","cmwap"
AT+CGDCONT=1,"IP","cmwap"
OK
--> Sending: ATQ0 V1 E1 S0=0
ATQ0 V1 E1 S0=0
OK
--> Modem initialized.
wvdial: utils/wvtask.cc:198: WvTaskMan::WvTaskMan(): Assertion `getcontext(&get_stack_return) == 0' failed.
已放弃

wvdial的配置文件其内容为：
debian:/home/root/wvdial# cat /etc/wvdial.conf
[Dialer Defaults]
Init1 = AT+CGDCONT=1,"IP","cmwap"
Init2 = ATQ0 V1 E1 S0=0
Modem Type = USB Modem
Baud = 460800
New PPPD = yes
Modem = /dev/ttyACM0
ISDN = 0
Phone = *99***1#
Password = any
Username = any
Stupid Mode = yes

我在网上搜过，只有一个老外曾遇到一个跟我一样的问题，但是他是在嵌入式中做的，用的是华为的3G模块。有谁曾经遇到过>这种问题吗？能否指点一下，在此先谢过啦^_^.
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