On Friday 08 August 2008 13:33:35 Andy Walls wrote:
> On Fri, 2008-08-08 at 11:08 +0200, Hans Verkuil wrote:
> > Hi Mache,
> >
> > First try to use the 'bleeding edge' drivers
> > (http://www.ivtvdriver.org/index.php/Download#Bleeding_Edge_driver)
> >.
> >
> > If that gives you the same problem, then test whether calling
> > v4l2-ctl --set-audio-input=1 works for you or not and report back
> > the result.
> >
> > The problem with this issue is that 1) I can't reproduce it, and 2)
> > only a few people seem to get it. I thought I had it fixed, but
> > apparently it can still happen occasionally.
>
> Hans,
>
> My best guess, based on the information and cx25843 register dumps
> Kevin Blair provided in May, June and early July, is that the
> microcontroller is adjusting cx25843 register settings based on what
> its detecting from the tuner, even though line in what the user
> currently is using.
>
> There were a few changes to the cx25840 module in the past year and a
> half that may have inadvertently re-introduced the problem (
> hg -v log -p cx25840-audio.c | less). Kevin found that rolling back
> kernel versions in his setup made the problem go away.
>
> I was going to try and reproduce the problem when I had some cx18
> problems resolved (i.e. not for at least 2-3 weeks). I'm guessing a
> critical step to reproducing the problem would be to leave the
> antenna cable unhooked or to leave the tuner tuned to a channel that
> was weak or full of snow; thus causing the microcontroller to keep
> adjusting the cx28543 registers as it tried to process bogus SIF.
Hi Andy,
But how can this happen at all? With line-in selected the audio
microcontroller is stopped! So it shouldn't touch registers at all. The
only thing I can think of that there is some race condition when
switching inputs where the microcontroller changes registers just
before it is turned off.
Regards,
Hans
>
>
> Regards,
> Andy
>
> > Regards,
> >
> > Hans
> >
> > On Friday 08 August 2008 06:41:51 Mache Creeger wrote:
> > > Any ideas?
> > >
> > > -- Mache
> > >
> > > At 08:02 PM 8/6/2008, Mache Creeger wrote:
> > > >I am using the latest MythTV release on the latest kernel
> > > > release of Fedora 9, with the nvidia kernel-specific drivers,
> > > > on an Asus P1-AH2 motherboard. I have a PVR-150 installed and
> > > > use the stereo and composite video RCA jacks for input from my
> > > > cable decoder box. I do not use the coax tuner as input.
> > > >
> > > >I get intermittent tininess in the audio when I record and I
> > > >experienced the exact same symptoms on an earlier system which
> > > > had a different PVR-150 in a VIA EPIA M10000 running Fedora 8
> > > > and used the stereo and composite video RCA jacks.
> > > >
> > > >Based on that experience and other postings on the Internet,
> > > > there seems to be problem in the ivtv driver for the PVR-150
> > > > that causes tininess in the audio when you record from the
> > > > stereo RCA jacks and not from the tuner
> > > >
> > > >I noticed that some folks run "/usr/local/bin/v4l2-ctl
> > > >--set-audio-input=1 -d /dev/video0" in a cron job that runs
> > > > every minute as a solution.
> > > >
> > > >Are there any other ways to address this problem? Has it been
> > > >registered as a bug and if so any idea if or when it could be
> > > > resolved?
> > > >
> > > >-- Mache Creeger
> >
> > _______________________________________________
> > ivtv-users mailing list
> > [email protected]
> > http://ivtvdriver.org/mailman/listinfo/ivtv-users
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