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[Juha Jeronen <1507957@xxxxxxxxxxxxxxxxxx>]

I'm getting the original variant of this issue: my Huawei E3372
(vendor:device 12d1:14dc) works only if plugged in several times.
Sometimes one replug is enough, sometimes three or even four.

I'm running Linux Mint 17.2, which is based on Ubuntu 14.04 LTS, so the
issue is probably older than Ubuntu 15.10.

This occurs on both the default 3.13 kernel and the updated 3.19 kernel
(3.9.0-39-generic).

Attached is the output of dmesg when the modem is plugged to the USB
port, both in the failed and success cases. From what I can immediately
see, the device ID is detected differently in these cases, so this might
indeed have something to do with usb-modeswitch and not the kernel
itself.

When it fails, it seems the modem is detected as a CD-ROM, resulting in
I/O errors. When it succeeds, there is no mention of a CD-ROM before the
modem is detected as a HUAWEI_MOBILE.

The read errors are surprising, since to my understanding these kinds of
modems first usually identify themselves as a CD-ROM (to provide Windows
drivers), before performing the switch to modem mode. One possible
explanation would be a race condition: maybe usb-modeswitch sometimes
attempts to perform the switch while the "CD-ROM" is being read, causing
both the read to fail and the modem not to perform the switch correctly.

Or maybe not. This probably needs an expert opinion :)


** Attachment added: "dmesg output of both failed and success cases"
   https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1507957/+attachment/4562104/+files/dmesg-E3372.txt

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https://bugs.launchpad.net/bugs/1507957

Title:
  Huawei E3372 LTE modem on 15.10 works only when connecting via wvdial
  and not network-manager

Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  If you plug the modem first time after booting, it cannot connect.
  Hovewer, after you unplug it and plug it again, it works like a charm.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-30-generic 3.19.0-30.34
  ProcVersionSignature: Ubuntu 3.19.0-30.34-generic 3.19.8-ckt6
  Uname: Linux 3.19.0-30-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  cysioland   2089 F.... pulseaudio
   /dev/snd/controlC0:  cysioland   2089 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Oct 20 11:28:10 2015
  HibernationDevice: RESUME=UUID=ed44c356-6a11-447b-94bc-88d54b0ead64
  InstallationDate: Installed on 2014-10-14 (370 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Acer Extensa 5635G
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-30-generic root=UUID=31750940-1f18-4f57-8933-4f779556f31b ro quiet splash libata.allow_tpm=1
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-30-generic N/A
   linux-backports-modules-3.19.0-30-generic  N/A
   linux-firmware                             1.143.3
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-05-23 (149 days ago)
  dmi.bios.date: 12/21/2009
  dmi.bios.vendor: Phoenix
  dmi.bios.version: V1.3311
  dmi.board.name: BA50-MV
  dmi.board.vendor: Acer
  dmi.board.version: Not Applicable
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnPhoenix:bvrV1.3311:bd12/21/2009:svnAcer:pnExtensa5635G:pvrNotApplicable:rvnAcer:rnBA50-MV:rvrNotApplicable:cvnAcer:ct10:cvrN/A:
  dmi.product.name: Extensa 5635G
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Acer

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