Re: Slow mobile broadband detection

[dave guandalino <guandalino gmail com>]

> Except that patch only works for the 'option' driver, which is where
> most 3G modem USB IDs should be added.  If your device's IDs aren't
> there, you can't take advantage of the fix.  What are your device's IDs?

Well. How can I determine them and check if they are present or not?

Btw, the 'option' driver gets loaded.
$ lsmod | grep option
option                 25285  2
usb_wwan               20407  1 option
usbserial              42908  7 option,usb_wwan

$ modinfo option
filename:
/lib/modules/2.6.38-8-generic/kernel/drivers/usb/serial/option.ko
license:        GPL
version:        v0.7.2
description:    USB Driver for GSM modems
author:         Matthias Urlichs <smurf smurf noris de>
srcversion:     0D74972353E56E42A1951FF
alias:          usb:v1EE8p000Bd*dc*dsc*dp*ic*isc*ip*
...a lot of other alias lines...

>
> Dan
>
>>
>> >
>> > Perazim
>> >
>> > On Thu, 2011-05-12 at 21:29 +0100, perazim portugalmail pt wrote:
>> >>
>> >> Dan,
>> >>
>> >> Attached are the messages log and the modem-manager log for the Alcatel
>> >> X220.
>> >>
>> >> Let me know if you need any other info or to test anything.
>> >
>> > These logs indicate a kernel bug, with a 30 second hang when closing a
>> > serial port.  I submitted a patch to the kernel to fix this issue which
>> > was accepted for the 2.6.37 kernel:
>> >
>> > commit 02303f73373aa1da19dbec510ec5a4e2576f9610
>> > Author: Dan Williams <dcbw redhat com>
>> > Date:   Fri Nov 19 16:04:00 2010 -0600
>> >
>> >    usb-wwan: implement TIOCGSERIAL and TIOCSSERIAL to avoid blocking
>> > close(2)
>> >
>> >    Some devices (ex ZTE 2726) simply don't respond at all when data is sent
>> >    to some of their USB interfaces.  The data gets stuck in the TTYs queue
>> >    and sits there until close(2), which them blocks because closing_wait
>> >    defaults to 30 seconds (even though the fd is O_NONBLOCK).  This is
>> >    rarely desired.  Implement the standard mechanism to adjust closing_wait
>> >    and let applications handle it how they want to.
>> >
>> >    Signed-off-by: Dan Williams <dcbw redhat com>
>> >
>> > and the ModemManager snapshot you have should have the support necessary
>> > here.  What kernel version are you running?
>> >
>> > Dan
>> >
>> > _______________________________________________
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>> >
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>
>
>