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$ lsb_release -rd
Description:    Ubuntu 13.10
Release:        13.10

$ apt-cache policy dahdi-dkms
dahdi-dkms:
  Instaled: 1:2.5.0.1+dfsg-1ubuntu3
  Candidate: 1:2.5.0.1+dfsg-1ubuntu3


on /usr/src/dahdi-2.5.0.1+dfsg-1ubuntu3/dkms.conf

MAKE[0]="(make modules KERNVER=$kernelver …"

But on /usr/src/dahdi-2.5.0.1+dfsg-1ubuntu3/Makefile  kernel version is
set using KVERS variable.

ifndef KVERS
KVERS:=$(shell uname -r)
endif

Consequently modules was builded using current kernel headers.
On kernel upgrade, compiled modules don't work correctly on new kernel.

$ uname -a    
Linux myhostname 3.11.0-14-generic #21-Ubuntu SMP Tue Nov 12 17:04:55 UTC 2013 
x86_64 x86_64 x86_64 GNU/Linux


$ modinfo dahdi
filename:       /lib/modules/3.11.0-14-generic/updates/dkms/dahdi.ko
alias:          dahdi_dummy
license:        GPL v2
description:    DAHDI Telephony Interface
author:         Mark Spencer <[email protected]>
version:        2.5.0.1
srcversion:     C983F7FD45B28D0A501EEE0
depends:        crc-ccitt
vermagic:       3.11.0-13-generic SMP mod_unload modversions 
parm:           debug:Sets debugging verbosity as a bitfield, to see general 
debugging set this to 1. To see RBS debugging set this to 32 (int)
parm:           deftaps:int
parm:           max_pseudo_channels:Maximum number of pseudo channels. (int)
parm:           hwec_overrides_swec:When true, a hardware echo canceller is 
used instead of configured SWEC. (int)


Needs rebuild modules after boot with new kernel:

$ sudo dkms remove -m dahdi/2.5.0.1+dfsg-1ubuntu3 -k $(uname -r) 
$ sudo dkms install -m dahdi/2.5.0.1+dfsg-1ubuntu3 -k $(uname -r)

** Affects: dahdi-linux (Ubuntu)
     Importance: Undecided
         Status: New

-- 
dahdi-dkms is not compiling correct
https://bugs.launchpad.net/bugs/1257160
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