REGRESSION: MBIM kernel suppport should be disabled until userspace support available (breaks Ericsson H5321 etc.)
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Linux |
Fix Released
|
Medium
|
|||
linux (Debian) |
Invalid
|
Undecided
|
Unassigned | ||
linux (Ubuntu) |
Triaged
|
Low
|
Unassigned | ||
modemmanager (Ubuntu) |
Invalid
|
Critical
|
Unassigned |
Bug Description
"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-
2) Set the kernel parameter "prefer_mbim" to false for "cdc_ncm" module. This could be done by adding a file "/etc/modprobe.
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 04188f3010f64dd
3) Debian has solved it by patching the kernel to reverse the default to be not to use MBIM:
http://
http://
WORKAROUND: Add in /etc/modprobe.
options cdc_ncm prefer_mbim=N
summary: |
MBIM kernel suppport should be disabled until userspace support - available + available (breaks Ericsson H5321 etc.) |
Changed in linux (Ubuntu): | |
importance: | Undecided → High |
Changed in modemmanager (Ubuntu): | |
importance: | Undecided → High |
Changed in linux (Ubuntu): | |
importance: | High → Critical |
Changed in modemmanager (Ubuntu): | |
importance: | High → Critical |
summary: |
- MBIM kernel suppport should be disabled until userspace support - available (breaks Ericsson H5321 etc.) + REGRESSION: MBIM kernel suppport should be disabled until userspace + support available (breaks Ericsson H5321 etc.) |
tags: | added: regression-release |
Changed in linux (Ubuntu): | |
milestone: | none → ubuntu-13.04 |
Changed in modemmanager (Ubuntu): | |
milestone: | none → ubuntu-13.04 |
Changed in linux: | |
importance: | Unknown → Medium |
status: | Unknown → Fix Released |
description: | updated |
Changed in linux (Debian): | |
status: | New → Fix Committed |
description: | updated |
tags: | added: raring |
description: | updated |
Status changed to 'Confirmed' because the bug affects multiple users.