The issue still exists in the v3.17-rc6 kernel.
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https://bugs.launchpad.net/bugs/1373116
Title:
cdc_acm causes Pantech UML295 reset
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
Description: Ubuntu 14.04.1 LTS
Release: 14.04
When I upgraded to 14.04 (3.13 kernel), the Pantech UML295 4G Modem
stopped functioning properly.
Expected behavior:
The modem starts up with a red LED lit while it initialized. Once a
connection is established, linux recognizes a USB ethernet connection
(cdc_ether), and the LED on the device goes green and flashing, indicating
active connection. This status remains until the device is disconnected.
Observed behavior:
The modem starts up normally, getting to the point that a cdc_ether
device is set up and a working internet connection is established. Shortly
after this, the modem's light goes blue (an LED color that the documentation
shows no information for), the ethernet connection fails, and the device goes
back to the beginning of its initialization. The process will repeat
indefinitely.
This behavior can be avoided, and a connection maintaned, by
blacklisting cdc_acm. However, this breaks many other USB serial
devices.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-35-generic 3.13.0-35.62
ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
Uname: Linux 3.13.0-35-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.4
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: charlie 1799 F.... pulseaudio
/dev/snd/controlC0: charlie 1799 F.... pulseaudio
/dev/snd/pcmC0D0c: charlie 1799 F...m pulseaudio
CurrentDesktop: X-Cinnamon
Date: Tue Sep 23 16:16:04 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-09-04 (18 days ago)
InstallationMedia: Kubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64
(20140722.2)
MachineType: LENOVO Lenovo IdeaPad P580
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-35-generic.efi.signed
root=/dev/mapper/sysvg-lvroot ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-35-generic N/A
linux-backports-modules-3.13.0-35-generic N/A
linux-firmware 1.127.5
SourcePackage: linux
StagingDrivers: rts5139
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/14/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: 5ECN96WW(V9.01)
dmi.board.asset.tag: No Asset Tag
dmi.board.name: INVALID
dmi.board.vendor: LENOVO
dmi.board.version: 00000000INVALID
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo IdeaPad P580
dmi.modalias:
dmi:bvnLENOVO:bvr5ECN96WW(V9.01):bd03/14/2013:svnLENOVO:pnLenovoIdeaPadP580:pvrLenovoIdeaPadP580:rvnLENOVO:rnINVALID:rvr00000000INVALID:cvnLENOVO:ct10:cvrLenovoIdeaPadP580:
dmi.product.name: Lenovo IdeaPad P580
dmi.product.version: Lenovo IdeaPad P580
dmi.sys.vendor: LENOVO
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