** 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."
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
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?
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
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
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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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