[mythtv-users] udev and systemd requirements for MythTV on Ubuntu 20.04?

[James Abernathy]

On Mon, Jul 27, 2020 at 11:55 AM Mike Bibbings <mike.bibbings at gmail.com>
wrote:

> On 27/07/2020 15:43, James Abernathy wrote:
> > I'm doing some planning for moving from MythTV v31 on Ubuntu 18.04 to
> > MythTV v31 on Ubuntu 20.04.  There are a lot of considerations, like
> > my current system using MariaDB and the current issue regarding that
> > on Ubuntu 20.04.
> >
> > However, my concerns today are related to udev rules and systemd
> > overrides.
> >
> > On my 18.04 system, I have one udev rule related to mythtv;
> > 99-mythbackend.rules
> >
> > SUBSYSTEM=="video4linux", TAG+="systemd"
> > SUBSYSTEM=="dvb", TAG+="systemd"
> > SUBSYSTEM=="firewire", TAG+="systemd"
> >
> > When I installed mythtv v31 on a virtual machine of Ubuntu 20.04, this
> > file was not there. I probably created it myself because of the
> > Hauppauge WinTV HD Quad PCIe tuner card I was using.
> >
> > So is this still necessary for Ubuntu 20.04 and mythtv v31?
> >
> > Also,  on my current system I have an override file in
> > /etc/systemd/system/mythtv-backend.service.d/ythtv-backend-override.conf:
> > [Unit]
> > Wants=dev-dvb-adapter0-frontend0.device
> > After=dev-dvb-adapter0-frontend0.device
> > Wants=dev-dvb-adapter1-frontend0.device
> > After=dev-dvb-adapter1-frontend0.device
> > Wants=dev-dvb-adapter2-frontend0.device
> > After=dev-dvb-adapter2-frontend0.device
> > Wants=dev-dvb-adapter3-frontend0.device
> > After=dev-dvb-adapter3-frontend0.device
> >
> > After=NetworkManager-wait-online.service
> >
> > I figure this is also related to the Hauppauge card and also my
> > HDHomerun tuner.
> >
> > Again I think I did this back with mythtv29 and it's stayed through
> > the upgrades to v31.
> >
> > Do I need any of this in mythtv v31 on Ubuntu 20.04?
> >
> > On the Ubuntu 20.04 test virtual machine I have only the HDHR tuner
> > and it works fine but I have no udev rules or systemd override file.
> >
> > Thoughts?
> >
> > Jim A
> >
> Jim,
>
> Yes, you did setup those entries for your PCI-e tuner, they make sure
> mythtvbackend starts only when the card has been fully setup during boot.
>
>
> For network tuners e.g. HDHOMERUN there is a different problem in that
> mythtv-backend can start before networking is fully established see
> https://lists.gt.net/mythtv/users/625986#625986
>
>
> Mike
>

So it seems the udev rules for the PCIe cards are still required in Ubuntu
20.04, right?

I'm aware of the systemd stuff for networked tuners that you linked to. In
fact I had to use that back with v29 when you had to use external recorders
in mythtv-setup in the card section for TCP communication to HDHomerun
tuners, because that software took a while to start up. However, for some
reason when I upgraded to v30/31 I removed that and now am left with what I
showed above.

I know that with my HDHR4-2US and HDHR5-4US networked tuners I don't need
anything in systemd for either Ubuntu 20.04 or Raspberry Pi OS on RPi4.

At least I've been lucky. Everytime I reboot my tuners are available and
working in mythtv-backend without systemd overrides.

Jim A
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