OSLEC module can't be loaded.

[Babstar]

Binary package hint: dahdi-linux

I am trying to use the OSLEC echo canceller, however, the module loading fails.

$lsb_release -rd
Description: Ubuntu 9.10
Release: 9.10

$ apt-cache policy dahdi-linux
dahdi-linux:
  Installed: 1:2.2.0.2~dfsg-1ubuntu2
  Candidate: 1:2.2.0.2~dfsg-1ubuntu2
  Version table:
 *** 1:2.2.0.2~dfsg-1ubuntu2 0
        500 http://apt-proxy karmic/universe Packages
        100 /var/lib/dpkg/status

$ sudo modprobe dahdi_echocan_oslec
WARNING: All config files need .conf: /etc/modprobe.d/dahdi, it will be ignored in a future release.
FATAL: Error inserting dahdi_echocan_oslec (/lib/modules/2.6.31-16-generic/updates/dkms/dahdi_echocan_oslec.ko): Unknown symbol in module, or unknown parameter (see dmesg)

$dmeg
[ 3598.879299] dahdi_echocan_oslec: disagrees about version of symbol oslec_create
[ 3598.879315] dahdi_echocan_oslec: Unknown symbol oslec_create
[ 3598.879549] dahdi_echocan_oslec: disagrees about version of symbol oslec_update
[ 3598.879554] dahdi_echocan_oslec: Unknown symbol oslec_update
[ 3598.880335] dahdi_echocan_oslec: disagrees about version of symbol oslec_free
[ 3598.880344] dahdi_echocan_oslec: Unknown symbol oslec_free

[hackeron (hackeron)]

Same problem here :( - Anyone have a solution?

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[James Cox (james-s-cox)]

Can confirm this is still an issue. Slightly different error message...

$ lsb_release -rd
Description: Ubuntu 14.04.1 LTS
Release: 14.04

$ apt-cache policy dahdi-linux
dahdi-linux:
  Installed: 1:2.5.0.1+dfsg-1ubuntu4~14.04.2
  Candidate: 1:2.5.0.1+dfsg-1ubuntu4~14.04.2
  Version table:
 *** 1:2.5.0.1+dfsg-1ubuntu4~14.04.2 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/universe amd64 Packages
        100 /var/lib/dpkg/status
     1:2.5.0.1+dfsg-1ubuntu3 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/universe amd64 Packages

$ sudo modprobe dahdi_echocan_oslec
modprobe: ERROR: could not insert 'dahdi_echocan_oslec': Invalid argument

$dmesg

[247247.802830] dahdi_echocan_oslec: disagrees about version of symbol oslec_create
[247247.802840] dahdi_echocan_oslec: Unknown symbol oslec_create (err -22)
[247247.802850] dahdi_echocan_oslec: disagrees about version of symbol oslec_update
[247247.802854] dahdi_echocan_oslec: Unknown symbol oslec_update (err -22)
[247247.802896] dahdi_echocan_oslec: disagrees about version of symbol oslec_free
[247247.802899] dahdi_echocan_oslec: Unknown symbol oslec_free (err -22)

[Charles Boling (junk07+launchpad)]

After a upgrade: Ubuntu 12.04 --> 14.04 (dahdi 2.4.1 --> 2.7.0)
I suddenly had echo, and found that echo_cancellation was turned off. Seeing same messages above.

[Charles Boling (junk07+launchpad)]

I tried the tip in http://wiki.openvox.cn/index.php/OSLEC_Softecho_Module_Installation_for_DAHDI that said for DAHDI 2.5.0+, to uncomment this line in the source file linux/drivers/dahdi/Kbuild:
     obj-m += dahdi_echocan_oslec.o //enable this
I did so and did a remove/build/install of the dahdi dkms modules, but it still doesn't let the oslec module load. :-(

I finally tired of chasing it down, and used the mg2 canceller for now.

[BitBrusher (ethy-brito)]

Had same problem here.

I managed to the conclusion that echo.ko that is in my kernel is not the same compiled together with dahdi_echocan_oslec!

Look:
md5sum /lib/modules/3.13.0-66-generic/kernel/drivers/staging/echo/echo.ko
4d13d548ea08ee01fe9958de736f121c /lib/modules/3.13.0-66-generic/kernel/drivers/staging/echo/echo.ko

while

md5sum /var/lib/dkms/dahdi/2.5.0.1+dfsg-1ubuntu4~14.04.4/3.13.0-66-generic/x86_64/module/echo.ko
dbf4152d6c86853d8791dbdd36889c34 /var/lib/dkms/dahdi/2.5.0.1+dfsg-1ubuntu4~14.04.4/3.13.0-66-generic/x86_64/module/echo.ko

Rename "/lib/modules/3.13.0-66-generic/kernel/drivers/staging/echo/echo.ko" to something else and

cp /var/lib/dkms/dahdi/2.5.0.1+dfsg-1ubuntu4~14.04.4/3.13.0-66-generic/x86_64/module/echo.ko \
/lib/modules/3.13.0-66-generic/kernel/drivers/staging/echo/echo.ko

execute "modprobe dahdi_echocan_oslec"

and things will work. At least the module will load flawlessly.

This is a test environmet and I still do not know if oslec is doing its job.

A problem I am facing now is that "dahdi_echocan_oslec" is not been loaded "automatically".
I must do it "manually". My production system loads it automatically.
I mean, there is not an explicit "modprobe dahdi_echocan_oslec" I can find anywhere.
"service dahdi stop" unloads it, but does not loads it!

Cheers