The 3G USB modem can connect sometimes, sometimes not

Question

PROBLEM:

1. The netbook can sometimes, sometimes not, connect to the internet mobile broadband 3G (or 2G GSM) via USB 3G modem.

2. For it to connect to mobile broadband (when it can) I have, after sticking the modem into the USB port, and then enter the shell prompt with the command:

   / Sys/bus/usb-serial/drivers/option1/new_id

3. Then I have to restart the network-manager:

   Service network-manager restart

   The shell reports the number xxxx this process.

4. Entering the command:

   ps aux

   Then, I annotate the number yyyy of the process /sys/sbin/modem-manager

5. Then I change the priority of these two processes for priority for maximum priority:

   renice -20 xxxx yyyy

6. So, sometimes, I get a 3G connection. I do not know if he can connect on 2G (GSM), but it seems to me that when the connection changes from 3G to GSM she soon falls - but I am not sure.

   • When the connection is not achieved, the modem-manager is constantly trying. It can be seen that through the connection icon in the upper right side of the screen.

7. Yesterday, Saturday 12/Jan/2012 I tried to connect to the internet and could not. The system detected an error and asked me if I wanted to send an error message. I accepted, but as I was not connected to the internet, I copied the details of the problem. Today, Sunday 13/Jan/2012 I got the connection and I sent you the error report. The error details are below (may have some copy error because the report is very large):

    Executable Path
       /usr/sbin/modem-manager
   
    Package
       modemmaneger 0.5.2.0ubuntu2
   
    Problem Type
       Crash
   
    Title
       modem-manager crashed with SIGSEGV in molloc()
   
    ApportVersion
       2.0.1-0ubuntu15.1
   
    Architeture
       i386
   
    CoreDump
   
    CrashCounter
       1
   
    Date
       sat Jan 12 08:28:36 2013
   
    Dependencies
   
    Disassembly
   
    DistroRelease
       Ubuntu 12.04
   
    InstallationMedia
       Ubuntu 12.04 LTS “Precise Pangolin” - Release i386 (20120817. . . . . 
   
    MarkForUpload
       True
   
    PackageArchiteture
       i386
   
    ProcCndline
       /usr/sbin/modem-manager
   
    ProcEnviron
       PATH=)custon, no user) 
       TERM=linux
   
    ProcMaps
   
    ProcStatus
   
    ProcVersionSignature
       Ubuntu 3.2.0-35.55 – generic-pae 3.2.34
   
    registers
   
    SegvAnalysis
       Segfault happened at: 0xb745b1b7:cmp 0x8(%edx),%ecx
       pc(0xb745b1b7) ok
       source”0x8(%edx)” (0x3f47455a) not located in a know VMA region (need readable region)!Destination”%ecx” ok
   
    SegvReason
       reading unknown VMA
   
    Signal 11
   
    SourcePackage
       modemmanager
   
    Stacktrace
   
    StacktraceTop
   
    Tags
       precise
   
    ThreadStacktrace
   
    Uname
       Linux 3.2.0-35-generic-pae i686
   
    UpgradeStatus
       No uppgrade log present (propably fresh install)
   
    UserGroups