[mythtv-users] Sound corruption then hard lock when recording from firewire

Chris Weiland hobbiticus at gmail.com
Fri Feb 2 18:03:32 UTC 2007

I don't have another computer that I can ssh from.  However, shouldn't there
be some sort of log that would persist through a reboot?  Or would there be
a way to tell if this was a driver, kernel, or software problem?

On 2/1/07, R. G. Newbury <newbury at mandamus.org> wrote:
> Chris Weiland wrote:
> > I'm not exactly sure what's causing this, since I am unable to
> investigate
> > after the problem occurs, but there is definately something very wrong
> > going
> > on with my firewire recording.
> >
> > After a few minutes to close to an hour of watching live tv (it may
> happen
> > with recordings too, but I havn't tested that with confidence yet)
> through
> > my cable box that is connected via firewire, the audio output will
> suddenly
> > turn into a high pitched whine.  This seems to happen completely at
> random.
> > However, the video remains intact.  I seem to be able to continue
> watching
> > for as long as I like as long as I don't switch channels or stop
> watching,
> > and my CPU and ram usage don't seem to be effected.
> >
> > As soon as I tune off of that channel, no matter how I do it, my
> computer
> > becomes completely unresponsive - mouse freezes,  video freezes, numlock
> > doesn't respond, can't kill X or switch to a virtual console -
> nothing.  I
> > have to reboot to get back my system.  What's stranger is that if I go
> to
> > playback the live tv recording of what I was watching, the audio is
> still
> > good, even when I was just hearing the whine.
> >
> > I don't know which logs to look at for this.  I don't have much
> experience
> > when it comes to troubleshooting hard lockups like this, so I don't even
> > know where to start.
> >
> A good way to start would be to get another computer so that you can ssh
> into your mythtbox, preferably before it locks up. and then see if you
> can trigger the lockup. Also useful is an nfs mount into the box. That
> way you can use ssh to copy the logs, to the mount folder, and then copy
> them to your other computer.
> Geoff
> (Who is trying to get a trace on what causes X to lock up on a Via
> Sp13000 using xvmc...)
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