[mythtv-users] HDHomeRun issues following OS upgrade to Ubuntu 18.04 from 16.04

[Jan Ceuleers]

On 29/08/2020 11:47, Klaas de Waal wrote:
> 
>     I however confirm that my channel changing script (which is plugged into
>     MythTV as an event handler since HDHR tuners don't support a channel
>     changing script directly) is indeed necessary. I'm not sure why as I
>     don't know what commands MythTV issues to the HDHR. Perhaps the commands
>     MythTV sends cause the HDHR to rely on defaults for some unspecified
>     parameters which work in many places around the world but not with my
>     particular cable provider (which is Telenet in Belgium).
> 
> 
> Older MythTV versions give an "auto:frequency" command and then the
> HDHomeRun tries all modulation schemes configured in parameter
> /sys/dvbc_modulation. If you modulation scheme is not in this list then
> tuning will fail. Setting /sys/dvbc_modulation to what your provider
> uses (256qam and 6875 ksym/sec if the Internet is right) with the
> hdhomerun_config utility should fix it.
> This is solved in MythTV version 31. For the HDHomeRun DVB-C there is
> now a more explicit tuning command given that includes the symbol rate
> so it should now always work.
> For the full details see
> tickets https://code.mythtv.org/trac/ticket/12792 
> and https://code.mythtv.org/trac/ticket/13371#ticket.

Thanks Klaas.

/sys/dvbc_modulation already contains a8qam256-6875 so this does not
seem to be sufficient to work around the issue here. Still, I now have a
working setup so won't worry about it.

Cheers, Jan