[mythtv-users] dd hangs in HDPVR channel changer script

Scot Kreienkamp skreien at wcnet.org
Mon Mar 5 03:52:17 UTC 2018

Hi Andrew,

> Digging in a bit I can see that I've got a hung dd process coming from my
> channel changing script as found here - https://www.mythtv.org/wiki/
> Hauppauge_HD-PVR
This is the command from that script that I can see in my process list
> (with variables expanded as expected):
> timeout 2 dd if=${VDEV} of=/dev/null bs=4k count=1 1>/dev/null 2>/dev/null
> I can't kill the dd process and it even seems to prevent a reboot cycle
> from restarting. I have to power off the box before it will restart.
> To work around this I've removed the STB power on detection section from
> the channel changing script. It's only been a day, but so far things are
> working.
>  When that happened to me, I did the same, removed the dd command and it
worked.... for a few weeks.  Then things started going downhill fast.
Tried replacing the power cord, the USB cord, different ports, USB hubs,
etc.  Tried everything I could think of.  I ended up having to replace it
because nothing I did stabilized it.  I replaced it with another HDPVR I
had in storage that I forgot about and it's been stable ever since.

My point is, you may want to have a backup plan in your pocket in case
things go the same way.
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