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

[Klaas de Waal]

>
>
> 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.

Klaas.
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