"all tuners are currently busy" and mythweb not working properly

[linkku]

I did a fresh install of Mythbuntu 16.04. I have 3 identical Hauppauge Nova TD dual USB DVB-T tuners that use the DiBcom 7000PC driver. After a reboot if I try to watch live TV I get a message "All tuners are currently busy".

In addition to "all tuners are currently busy" my mythweb has all the headers in place but the Listings page has no content and says: "Warning at /usr/share/mythtv/mythweb/modules/_shared/tmpl/default/header.php, line 12: !!NoTrans: Cannot modify header information - headers already sent by (output started at /usr/share/mythtv/mythweb/modules/_shared/tmpl/default/header.php:152)!!"

After a backend restart 'sudo /etc/init.d/mythtv-backend restart' everything works.

This is possibly related to tuners not being ready before mythbackend starts up. There are a few possible workarounds, but I haven't picked one simple enough yet.

[linkku (aapo-anderson)]

An easy workaround was to add "ExecStartPre=/bin/sleep 15" line into my /lib/systemd/system/mythtv-backend.service file:

[Service]
User=mythtv
EnvironmentFile=-/etc/mythtv/additional.args
ExecStartPre=/bin/sleep 15
ExecStart=/usr/bin/mythbackend --quiet --syslog local7 $ADDITIONAL_ARGS
StartLimitBurst=10
StartLimitInterval=10m
Restart=on-failure
RestartSec=1

[linkku (aapo-anderson)]

Furthermore, you have to do the above everytime apt-get upgrade gives your distro a new /lib/systemd/system/mythtv-backend.service file.

[Thomas Mashos (tgm4883)]

We can't really delay an arbitrary about of time, as it would cause issues with waking to record. A better fix for you would be an overrride file, which should be in a different directory rather than changing the shipped startup files. See https://wiki.ubuntu.com/SystemdForUpstartUsers#Override_Files