saa7134-alsa and snd_card_new only error with alsa 1.0.19 / ubuntu 9.04 jaunty - tracked down, further help appreciated

saa7134-alsa and snd_card_new only error with alsa 1.0.19 / ubuntu 9.04 jaunty - tracked down, further help appreciated

[Lars Oliver Hansen]

Hello,

I'm getting exactly one error message in dmesg: saa7134_alsa: Unknown
symbol snd_card_new  which means I don't have any sound with analog tv.

I've tracked down the call to snd_card_new to the only location in
compat.h where it is called if #ifdef NEED_SND_CARD_CREATE is true. If
#ifdef NEED_SND_CARD_CREATE is true, there is also done an inclusion of
sound/core.h. Core.h is an alsa header which in the latest alsa 1.0.19
includes a definition of snd_card_new. However this definition is
missing in the sources that come with Ubuntu 9.04 Jaunty against which I
compiled the v4l-dvb sources (The saa7134-alsa error occurs with both my
compilation and did occur with the pre-compiled drivers which came with
9.04 Jaunty!).

Adding snd_card_new to the Ubuntu 9.04 sources was/is no good idea as it
calls its own snd_card_create from init.c which conflicts with
snd_card_create from compat.h which is the wrapper around snd_card_new
there.

As the call to snd_card_create in compat.h passes the identical argument
list as would be passed to init.c s snd_card_create later, I figured I
can add the declaration of snd_card_create to the core.h of the Ubuntu
9.04 sources which is/was missing too there as extern and disable the
snd_card_create in compat.h (compat.h includes core.h thus core.h s
extern snd_card_create should be called). As init.c does an
export_symbol of snd_card_create I guessed this could work.

So I would have instead of a wrapped call to a non-existant snd_card_new
a direct call to an exported snd_card_create.
Unfortunately I get this in dmesg now:

saa7134_alsa: no symbol version for snd_card_create
[ 4383.422044] saa7134_alsa: Unknown symbol snd_card_create

What can I do now?

Any help?

Thanks!


Best Regards

Lars

Re: saa7134-alsa and snd_card_new only error with alsa 1.0.19 / ubuntu 9.04 jaunty - tracked down, further help appreciated

[Lars Oliver Hansen]

Hi again,

Am Dienstag, den 05.05.2009, 21:33 +0200 schrieb Lars Oliver Hansen:
> So I would have instead of a wrapped call to a non-existant snd_card_new
> a direct call to an exported snd_card_create.

me adding snd_card_create to the Ubuntu sources (headers to be precise)
obviously means it wasn't present before and Ubuntus kernel was compiled
with that code missing, thus "no symbol_version" error message then!

I now opted for disabling the call to snd_card_new and letting v4l s
snd_card_create return -NOEMEM or so.

Now I get "saa7134 ALSA driver for DMA sound loaded" message in dmesg
but I have no sound in tvtime and neither aplay -L nor aplay -l list a
tv-card related sound device and I don't find any audio0 or sound0
device in /dev/.

Is NEED_SND_CARD_CREATE needed for my tv card? It was defined and the
~_new couldn't be found on loading the module, but would it have been
used? If not (or if), is there a way to get (still) sound in tvtime (or
mplayer)? My card is AVerMedia Cardbus TV/Radio (E506R) correctly
autodetected (if I can trust packaging and labelling of my card ;-)) :-)
(it's a hybrid dvb-t / analog device. Yes, dvb-t works, but the channel
I'm interested in occasionally has signal troubles (I'm at a triangle
vertex of the covered area)).

Thank you very much!

B&KR

Lars