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Re: Very slow-starting EVDO modem



On Wed, 26 Nov 2008 13:08:36 -0600
Frank Cox wrote:

> As you can see, it took six minutes before the device somehow reset itself and
> the machine realized that it had a modem attached.

I have now discovered what changes when the five minute delay is up.  As
mentioned before, the modem takes 5 minutes before it creates the /tty/USB?
devices.

Somehow, the modem changes its identity after being plugged in for 5 minutes.

When the modem is first plugged in, this is what is created in
/proc/bus/usb/devices:

T:  Bus=04 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  3 Spd=12  MxCh= 0
D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=1410 ProdID=5010 Rev= 0.00
S:  Manufacturer=Novatel Wireless Inc.
S:  Product=Novatel Wireless CDMA
S:  SerialNumber=091087439150000
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E:  Ad=87(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=08(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms

After five minutes, this is what I find in /proc/bus/usb/devices:

T:  Bus=04 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  4 Spd=12  MxCh= 0
D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=1410 ProdID=4100 Rev= 0.00
S:  Manufacturer=Novatel Wireless Inc.
S:  Product=Novatel Wireless CDMA
S:  SerialNumber=091087439151000
C:* #Ifs= 5 Cfg#= 1 Atr=a0 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
E:  Ad=81(I) Atr=03(Int.) MxPS=  16 Ivl=128ms
E:  Ad=82(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
I:* If#= 1 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
E:  Ad=84(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=04(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
I:* If#= 2 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
E:  Ad=89(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=09(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
I:* If#= 3 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
E:  Ad=8a(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=0a(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
I:* If#= 4 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E:  Ad=85(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=06(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms

Notice that the product id has magically changed from 5010 to 4100.  This is
the point at which the modem begins working and the /tty/USB? devices are
created.

I put this same modem on a machine running Centos 5 and found the exact same
behaviour, though I have to use a modprobe command to make it recognize the
modem on Centos 5 (modprobe usbserial vendor=0x1410 product=0x4100) and the
modprobe is not required to make it recognize the modem on Fedora 10.  The
product id changes in the same way in /proc/bus/usb/devices, after the same
five minute wait.

https://bugzilla.redhat.com/show_bug.cgi?id=473166

-- 
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