[mythtv-users] Duoflex tuning but no channels

[Stephen Worthington]

On Thu, 02 Apr 2015 10:54:03 +0100, you wrote:

>Help! 
>
>Mythtv can see my four Duoflex adaptors but can't see any channels.
>
>scan gives output like -
>
>>>> tune to: 
>682000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_AUTO:QAM_64:TRANSM
>ISSION_MODE_8K:GUARD_INTERVAL_1_32:HIERARCHY_NONE
>>>> tuning status == 0x00
>>>> tuning status == 0x1f
>WARNING: filter timeout pid 0x0011
>WARNING: filter timeout pid 0x0000
>WARNING: filter timeout pid 0x0010
>
>And says no channels.
>
>w_scan says -
>w_scan -c GB -f t -t 3 -F
>w_scan version 20130331 (compiled for DVB API 5.10)
>using settings for UNITED KINGDOM
>DVB aerial
>DVB-T GB
>scan type TERRESTRIAL, channellist 6
>output format vdr-2.0
>WARNING: could not guess your codepage. Falling back to 'UTF-8'
>output charset 'UTF-8', use -C <charset> to override
>Info: using DVB adapter auto detection.
>        /dev/dvb/adapter0/frontend0 -> TERRESTRIAL "CXD2837 DVB-C DVB-
>T/T2": very good :-))
>
>Using TERRESTRIAL frontend (adapter /dev/dvb/adapter0/frontend0)
>-_-_-_-_ Getting frontend capabilities-_-_-_-_
>Using DVB API 5.a
>frontend 'CXD2837 DVB-C DVB-T/T2' supports
>DVB-T2
>INVERSION_AUTO
>QAM_AUTO
>TRANSMISSION_MODE_AUTO
>GUARD_INTERVAL_AUTO
>HIERARCHY_AUTO
>FEC_AUTO
>FREQ (47.12MHz ... 865.00MHz)
><snip>
>658000: (time: 03:14) (time: 03:15) signal ok:
>        QAM_AUTO f = 658000 kHz I999B8C999D999T999G999Y999
>Info: no data from NIT(actual)
>
>And again no channels.
>
>dvb-few-tool shows all adaptors set to DVBT.
>
>So, it looks like we're turning but perhaps the demodulator isn't being 
>programmed correctly, or something?
>
>Maybe I need to take this to the linuxtv site instead of mythtv?

Is there a firmware file that needs to be loaded for these cards? That
sort of response is fairly typical of one chip not having its firmware
loaded.

I thought that the manufacturer had Linux support for those cards, so
it would probably be best to ask on their site forums or direct to
support.