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

R. G. Newbury newbury at mandamus.org
Fri Feb 2 04:14:56 UTC 2007

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.

(Who is trying to get a trace on what causes X to lock up on a Via 
Sp13000 using xvmc...)

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