Thank you for providing a patch, and making Ubuntu better.
Can you provide some information on the status of the patch with regards
to getting it merged upstream? Has it been sent upstream, what sort of
feedback has it received, is it getting applied to a subsystem
maintainer's tree, etc?
People affected by this bug are probably wondering why the kernel team
doesn't just apply the patch and fix it. The reason is that the kernel
team is reluctant (not opposed) to apply any patch to a stable kernel
that is not from upstream. Applying patches that don't come from
upstream add greatly to the support of the kernel as other upstream
patches may touch the same area as the non-upstream patch and may
prevent them from applying cleanly.
To submit your patch, send your patch with the detailed
description/changelog and your Signoff (ending with Signed-off-by: your
name <email>), to the emails listed from ./scripts/get_maintainer.pl
drivers/SUBSYSTEM-DETAILS (the get_maintainer.pl is from the kernel
sources). Once you have sent the patch upstream and it's accepted,
please drop a note here so that we can cherry-pick/include the patch
into Ubuntu kernel.
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Status: Confirmed => Triaged
** Tags added: kernel-da-key
** Tags removed: kernel-da-key
** Tags added: kernle-da-key
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https://bugs.launchpad.net/bugs/1802738
Title:
cdc_acm driver lacks trival support for Hiro (Conexant) H05228 USB
modem
Status in linux package in Ubuntu:
Triaged
Bug description:
I procured a USB modem manufactured by Hiro (model number H50228).
This is in fact a Conexant modem, and while some conexant models are
supported in cdc_adm, this particular type is not.
Hence, when I connect the modem to my system, cdc_adm does not
initialize the modem properly, as evidenced by errors reported through
journalctl:
Nov 10 21:46:10 <snip> kernel: usbcore: registered new interface driver
cdc_acm
Nov 10 21:46:10 <snip> kernel: cdc_acm: USB Abstract Control Model driver for
USB modems and ISDN adapters
Nov 10 21:47:01 <snip> kernel: cdc_acm 4-2:1.0: Zero length descriptor
references
Nov 10 21:47:01 <snip> kernel: cdc_acm: probe of 4-2:1.0 failed with error -22
Similar errors of this type have been reported previously, and
following the resolution for these errors I recompiled the cdc_acm
kernel module, after which the modem is successfully registered:
Nov 10 21:47:48 <snip> kernel: usbcore: registered new interface driver
cdc_acm
Nov 10 21:47:48 <snip> kernel: cdc_acm: USB Abstract Control Model driver for
USB modems and ISDN adapters
Nov 10 21:48:17 <snip> kernel: cdc_acm 4-2:1.0: ttyACM0: USB ACM device
With my modified kernel module, the modem works (at least for the
purposes I need it).
I will attach the patch once this bug has been opened. I don't know
how to submit a patch for formal consideration so need some help on
that front... Neither am I sure how to figure out exactly if this was
already addressed in an upstream fix.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-138-generic 4.4.0-138.164
ProcVersionSignature: Ubuntu 4.4.0-138.164-generic 4.4.155
Uname: Linux 4.4.0-138-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: jacobsma 4053 F.... pulseaudio
/dev/snd/controlC0: jacobsma 4053 F.... pulseaudio
/dev/snd/controlC2: jacobsma 4053 F.... pulseaudio
CurrentDesktop: XFCE
Date: Sun Nov 11 11:20:40 2018
HibernationDevice: RESUME=UUID=899fa33b-30cb-41f4-b709-557ad528a5bd
InstallationDate: Installed on 2016-03-06 (979 days ago)
InstallationMedia: Xubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64
(20160217.1)
MachineType: System manufacturer System Product Name
ProcFB: 0 nouveaufb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-138-generic
root=UUID=70a8bdf6-e697-4112-b584-4b650002555d ro
RelatedPackageVersions:
linux-restricted-modules-4.4.0-138-generic N/A
linux-backports-modules-4.4.0-138-generic N/A
linux-firmware 1.157.20
RfKill:
SourcePackage: linux
UpgradeStatus: Upgraded to xenial on 2018-03-16 (240 days ago)
dmi.bios.date: 09/11/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1701
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M5A78L-M LX PLUS
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr1701:bd09/11/2014:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM5A78L-MLXPLUS:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
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