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[Launchpad Bug Tracker <1431179@xxxxxxxxxxxxxxxxxx>]

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I lack the technical knowledge to know if this is a bug in udev, systemd
or another component.

After the switch to systemd, my 4G Huawei USB modem  no longer functions
as a modem unless I run usb_modeswitch to flip its state from USB mass
storage. The command I issue and its output is below, which also show
the Vendor and Product ID.

Strangely, it does not do this every time. Yesterday when I updated
using apt-get dist-upgrade upon reboot the modem worked as expected. But
from a cold boot this morning it did not.

$ sudo usb_modeswitch -v 0x12d1 -p 0x1f01 -J
[sudo] password for damon: 
Look for default devices ...
   product ID matched
 Found devices in default mode (1)
Access device 003 on bus 003
Current configuration number is 1
Use interface number 0
Use endpoints 0x01 (out) and 0x81 (in)

USB description data (for identification)
-------------------------
Manufacturer: HUAWEI Technology
     Product: HUAWEI Mobile
  Serial No.: FFFFFFFFFFFFFFFF
-------------------------
Using standard Huawei switching message
Looking for active driver ...
 OK, driver detached
Set up interface 0
Use endpoint 0x01 for message sending ...
Trying to send message 1 to endpoint 0x01 ...
 OK, message successfully sent
Reset response endpoint 0x81
 Could not reset endpoint (probably harmless): -99
Reset message endpoint 0x01
 Could not reset endpoint (probably harmless): -99
 Device is gone, skip any further commands
-> Run lsusb to note any changes. Bye!

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: udev 219-4ubuntu5
ProcVersionSignature: Ubuntu 3.19.0-8.8-generic 3.19.1
Uname: Linux 3.19.0-8-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.16.2-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
CustomUdevRuleFiles: 60-ssd-scheduler.rules
Date: Thu Mar 12 11:37:06 2015
InstallationDate: Installed on 2015-02-05 (34 days ago)
InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150205)
MachineType: LENOVO 427637U
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-8-generic root=UUID=eb18ef51-a2d0-4372-8eb9-ae009a05d4f6 ro quiet splash
SourcePackage: systemd
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/26/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: 8BET62WW (1.42 )
dmi.board.asset.tag: Not Available
dmi.board.name: 427637U
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr8BET62WW(1.42):bd07/26/2013:svnLENOVO:pn427637U:pvrThinkPadW520:rvnLENOVO:rn427637U:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 427637U
dmi.product.version: ThinkPad W520
dmi.sys.vendor: LENOVO

** Affects: usb-modeswitch (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: amd64 apport-bug vivid
-- 
USB 4G modem detected as USB mass storage
https://bugs.launchpad.net/bugs/1431179
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