[mythtv-users] Ubuntu 18.04.1 & MythTV v29.1 recording failures

[Andy Smith]

Hi,

It was all going so well ....  Recently migrated to new hardware and
OS (from Fedora) using a new Hauppauge WinTV-QuadHD quad DVB-T2 tuner
card. It has been working fine although MythBackend reports many
failures in mythbackend.log:

Sep 25 09:28:30 mustard mythbackend: mythbackend[1255]: E
TVRecEventtv_rec.cpp:3743 (TuningFrequency) TVRec[1]: Failed to set
channel to . Reverting to kState_None

These come initially with every recording that is started and I have
learned to ignore them until last night, 2 recordings failed
completely and apart from the fact that the log was filling with such
messages once per minute, it needed a reboot before anything could be
watched / recorded.  There was nothing particular in the backend log
that stood out to me that I wouldnt expect :-

Sep 24 20:59:04 mustard mythbackend: mythbackend[1107]: E TVRecEvent
tv_rec.cpp:3962 (TuningSignalCheck) TVRec[2]: TuningSignalCheck: Hit
pre-fail timeout
Sep 24 20:59:05 mustard mythbackend: mythbackend[1107]: E
TVRecEventtv_rec.cpp:3962 (TuningSignalCheck) TVRec[1]:
TuningSignalCheck: Hit
pre-fail timeout
Sep 24 20:59:06 mustard mythbackend: mythbackend[1107]: W
TVRecEventtv_rec.cpp:3993 (TuningSignalCheck) TVRec[2]:
TuningSignalCheck:
taking more than 6000 ms to get a lock. marking this recording as 'Failing'.
Sep 24 20:59:06 mustard mythbackend: mythbackend[1107]: W
TVRecEventtv_rec.cpp:3995 (TuningSignalCheck) TVRec[2]: See 'Tuning
timeout' in
mythtv-setup for this input

and likewise, nothing appeared in syslog or kern.log so I am a bit
stumped.  Has anyone seen this before with this card or has anyone got
any suggestions how to debug this?  Thanks.

$ mythbackend --version
Please attach all output as a file in bug reports.
MythTV Version : v29.1-38-gb9c5f8b
MythTV Branch : fixes/29
Network Protocol : 91
Library API : 29.20180316-1
QT Version : 5.9.5
Options compiled in:
 linux profile use_hidesyms using_alsa using_oss using_pulse
using_pulseoutput using_backend using_bindings_perl
using_bindings_python using_bindings_php using_crystalhd using_dvb
using_firewire using_frontend using_hdhomerun using_vbox using_ceton
using_hdpvr using_ivtv using_joystick_menu using_libcec
using_libcrypto using_libdns_sd using_libfftw3 using_libxml2
using_lirc using_mheg using_opengl using_opengl_video
using_opengl_themepainter using_qtwebkit using_qtscript using_qtdbus
using_taglib using_v4l2 using_x11 using_xrandr using_xv
using_profiletype using_systemd_notify using_systemd_journal
using_bindings_perl using_bindings_python using_bindings_php
using_freetype2 using_mythtranscode using_opengl using_vaapi
using_vdpau using_ffmpeg_threads using_mheg using_libass using_libxml2
using_libmp3lame

arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC887-VD Analog [ALC887-VD Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 2: ALC887-VD Alt Analog [ALC887-VD
Alt Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: CX23885 [Conexant CX23885], device 0: CX23885 Digital [CX23885 Digital]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 3: CX23885_1 [Conexant CX23885], device 0: CX23885 Digital
[CX23885 Digital]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

$ nvidia-smi
Tue Sep 25 16:21:54 2018
+------------------------------------------------------+
| NVIDIA-SMI 340.106    Driver Version: 340.106        |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  GeForce 210         Off  | 0000:01:00.0     N/A |                  N/A |
| N/A   31C   P12    N/A /  N/A |     49MiB /   511MiB |     N/A      Default |
+-------------------------------+----------------------+--