[mythtv-users] Backend Startup

[John]

On 28/11/2018 14:11, Mike Bibbings wrote:
> On 28/11/2018 11:35, John wrote:
>> I am experiencing flaky tuner startup at power on - reliable after 
>> restart.
>>
>> I notice that my two dual tuners USB & PCI are loading firmware after 
>> the backend starts. I tried putting a delay in mythbackend.service 
>> but this does not work. The tuners only start loading firmware after 
>> sytemd declares Startup finished.
>>
>> 11:16:13 tv systemd[1]: Started MythTV Backend.
>> Nov 28 11:16:13 tv systemd[1]: Startup finished in 6.524s (firmware) 
>> + 4.968s (loader) + 1.556s (kernel) + 37.074s (userspace) = 50.123s.
>> Nov 28 11:16:14 tv kernel: [   39.174505] m88ds3103 1-0069: 
>> downloading firmware from file 'dvb-demod-m88rs6000.fw'
>> Nov 28 11:16:17 tv kernel: [   42.065433] m88ds3103 1-0069: firmware 
>> version: 4.1
>> Nov 28 11:16:19 tv kernel: [   44.132909] m88ds3103 2-0069: 
>> downloading firmware from file 'dvb-demod-m88rs6000.fw'
>> Nov 28 11:16:22 tv kernel: [   47.018474] m88ds3103 2-0069: firmware 
>> version: 4.1
>> Nov 28 11:16:23 tv kernel: [   48.906105] si2168 8-0064: downloading 
>> firmware from file 'dvb-demod-si2168-b40-01.fw'
>> Nov 28 11:16:24 tv kernel: [   49.113970] si2168 8-0064: firmware 
>> version: B 4.0.11
>> Nov 28 11:16:24 tv kernel: [   49.166094] si2157 11-0060: firmware 
>> version: 3.0.5
>> Nov 28 11:16:25 tv kernel: [   50.192247] si2168 10-0067: downloading 
>> firmware from file 'dvb-demod-si2168-b40-01.fw'
>> Nov 28 11:16:25 tv kernel: [   50.393052] si2168 10-0067: firmware 
>> version: B 4.0.11
>> Nov 28 11:16:25 tv kernel: [   50.445052] si2157 12-0063: firmware 
>> version: 3.0.5
>>
>> How do I start the backend without systemd so that I can delay it 
>> until the tuners are fully initialised?
>>
>> _______________________________________________ 
>
> I don't know what your operating system is, or the tuners you have, so 
> the following is general for Ubuntu/Debian based systems using systemd.
>
> mythbackend when it starts up tests the tuners, so firmware will be 
> loaded if required by the appropriate driver.
>
> Note depending on tuner types you may need to increase timeouts using 
> mythtv-setup Capture Cards.
>
> On my systems (I am in UK) which have DVB-T/T2 tuners I use :
>
> Signal timeout (ms) 7000 (default is 1000), and Tuning timeout (ms) 
> 10000 (default 3000).
>
> These longer timeouts do not affect normal operation, but do slow down 
> initial channel scan.
>
> To ensure mythbackend is not started before tuners are ready :
>
> a) create a udev rules file named 99-tuner.rules in /etc/udev/rules.d/
>
> with the following contents:
>
> #
> # Create systemd device units for capture devices
> #
> SUBSYSTEM=="video4linux", TAG+="systemd"
> SUBSYSTEM=="dvb", TAG+="systemd"
> SUBSYSTEM=="firewire", TAG+="systemd"
>
> The file needs the following permissions so :
>
> sudo chown root:root /etc/udev/rules.d/ 99-tuner.rules
>
> sudo chmod u=rw,g=r,o=r /etc/udev/rules.d/ 99-tuner.rules
>
> b) add Wants/After to mythtv-backend service override file
>
> do not do this in mythtv-backend.service file, it gets overwritten on 
> updates
>
> sudo systemctl edit mythtv-backend.service  and add the required 
> contents for your tuners e.g.
>
> [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
>
> The rules correspond to the /dev/dvb/adapter<x> devices, so you need 
> to adjust Wants/After to be specific to your configuration.
>
>
> Mike
>
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Thanks I will give the longer timeouts a try