Marius B. Kotsbak, at this point I'm not seeing anything wrong with
syncing with Debian on this, despite the WORKAROUND. -> Triaged
** Description changed:
"commit bd329e1 ("net: cdc_ncm: do not bind to NCM compatible MBIM devices")
introduced a new policy, preferring MBIM for dual NCM/MBIM functions if
the cdc_mbim driver was enabled. This caused a regression for users
wanting to use NCM."
+ For background on this change please see Bug #1102343.
+
This could be solved in different ways:
+ 1) Remove "cdc_mbim.ko" from packages like linux-image-extra-3.8.0-XX-YY.
Easy, but makes it harder for people to experiment with MBIM and add userspace
support
- 1) Remove "cdc_mbim.ko" from packages like linux-image-extra-3.8.0-XX-
- YY. Easy, but makes it harder for people to experiment with MBIM and add
- userspace support
-
- 2) Set the kernel parameter "prefer_mbim" to false for "cdc_ncm" module.
- This could be done by adding a file "/etc/modprobe.d/avoid-mbim.conf"
- with content:
-
+ 2) Set the kernel parameter "prefer_mbim" to false for "cdc_ncm" module. This
could be done by adding a file "/etc/modprobe.d/avoid-mbim.conf" with content:
options cdc_ncm prefer_mbim=N
This will allow people wanting to test MBIM easy access by removing or
editing the file. Then the question is if this file should stay in
- modemmanager package or maybe in the kernel package?
+ modemmanager package or maybe in the kernel package? The required code
+ for this option to exist seems to be in Ubuntu Raring packages in commit
+ 04188f3010f64ddf2c75c3f4953eee9bdb4f5cc1.
- The required code for this option to exist seems to be in Ubuntu Raring
- packages in commit 04188f3010f64ddf2c75c3f4953eee9bdb4f5cc1.
-
- 3) Debian has solved it by patching the kernel to reverse the default to
- be not to use MBIM:
-
- http://web.archiveorange.com/archive/v/dbmrrKybrWTJ0XZGsB3B
+ 3) Debian has solved it by patching the kernel to reverse the default to be
not to use MBIM:
+
http://lists.alioth.debian.org/pipermail/kernel-svn-changes/2013-March/018852.html
http://lists.debian.org/debian-kernel/2013/03/msg00611.html
-
- See also bug #1102343.
WORKAROUND: Add in /etc/modprobe.d/cdc_ncm.conf :
options cdc_ncm prefer_mbim=N
** Changed in: linux (Ubuntu)
Importance: High => Low
** Changed in: linux (Ubuntu)
Status: Confirmed => Triaged
** Changed in: linux (Ubuntu)
Milestone: ubuntu-13.04 => ubuntu-14.04-feature-freeze
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https://bugs.launchpad.net/bugs/1169117
Title:
REGRESSION: MBIM kernel suppport should be disabled until userspace
support available (breaks Ericsson H5321 etc.)
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