[pvrusb2] can't get sound working

[Kay Rydyger]

Mike,

super ! it's working!
Apparently, I had a copy of a 29xxx firmware file lying around. Deleting that 
(and placing a copy of 24xxx firmware in another place, what I think is not 
relevant) solved the problem.

Thanks for your kind help! 

Kay

> On Fri, 30 Jun 2006, Kay Rydyger wrote:
> > Dear Mailinglist,
> >
> > I'm trying now for two or three weeks to get the pvrusb2 driver
> > working. The problem is that I'm getting no sound. The picture is ok,
> > I can also tune the channels. I'm using 2.6.17.1 on ubuntu 6.1 beta
> > with pvrusb2-mci-20060607. Naturally, I have consulted the
> > information on the Mike's web site, but to no avail. The Hauppauge is
> > a 24019RevC289 (2040:2400 Hauppauge).
> > Particularly, I played with the port setting of the tda9887, but no
> > results. However, I noticed that msp3400 is not loaded. I cannot get
> > msp3400 loaded.  Also, after manually loading the msp3400.ko (and/or
> > reloading the pvr drivers), nothing happens.
> > I include the log messages and the lsmod output here (sorry for the
> > long log...):
>
>     [...]
>
> Kay:
>
> Here's some info for you...
>
> You have a 24xxx model series device; this means that you don't need
> msp3400.  For 24xxx devices, the cx25840 chip handles both video and
> audio.  For older 29xxx device, cx25840 is replaced by msp3400 and
> saa7115.  So the msp3400 behavior you are seeing is actually correct.
>
> Right now when a given chip driver (e.g. cx25840) attaches to the pvrusb2
> driver, it gets asked to dump its status *at that point in time* into the
> log.  Since during device initialization you're not streaming anything,
> then seeing the audio muted is actually correct.
>
> You can trigger a status dump at any time by doing
>
>      cat /sys/class/pvrusb2/sn-*/debuginfo
>
> The output to the terminal will be a list of which chip drivers are
> talking to the pvrusb2 driver, but as an additional side effect all those
> chip drivers will also be asked to dump their current state to the system
> log.  So you can do that at any time to see what cx25840 is trying to do
> after you've started streaming from it.  So try that and see if it still
> shows up as muted.
>
> If you don't have the cx25840 firmware extracted and installed, then audio
> likely won't work.  This is a step specific to the 24xxx model series
> hardware.  With the older 29xxx model series msp3400 is used instead (and
> there's no firmware needed for it).  Read the web documentation setup
> section about firmware extraction, and keep in mind that you are dealing
> with a 24xxx device.
>
> You can examine the audio settings at any time through sysfs (in parallel
> with the V4L type controls that an app will handle).  For example
>
>      cat /sys/class/pvrusb2/sn-*/ctl_mute/cur_val
>
> will tell you if the audio is actually muted (from the point of view of
> the pvrusb2 driver).
>
> Do you get any sound at all with anything on this computer?  If you try to
> play a random mpeg file with mplayer do you get any sound?  If not, then
> you might have a soundcard and/or alsa issue.  Another thing you can try
> which is very simple: cat /dev/video0 into a file for say 10 seconds.
> That file will be a valid mpeg2 snippet.  You can then copy that file to
> another computer (where you already know the sound works) and then run
> mplayer on it.  See if you get sound in that case.  If you do this, you'll
> want to pre-tune a valid channel before you run cat (otherwise you will
> just capture static or a blank stream).  (And if you know the frequency
> you want to tune, then you can just echo that value in integer Hz straight
> into ctl_frequency/cur_val.)
>
> My understanding is that tda9887 setup is critical when in PAL (which is
> what I thought I saw in your log).  That being the case, then a tda9887
> foul-up can cause a loss of sound.  However the pvrusb2 driver already
> should be automatically configuring tda9887 for you.  So that should not
> be a cause for trouble.
>
> See if any of that helps to shed some light (or in this case sound) on the
> problem...
>
>    -Mike

	
	
		
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