[linux-dvb] HVR-1800 failing to detect any QAM256 channels

Michael Krufky mkrufky at linuxtv.org
Wed Apr 30 20:36:58 CEST 2008


On Wed, Apr 30, 2008 at 2:34 PM, Michael Krufky <mkrufky at linuxtv.org> wrote:
> 2008/4/30 Eric Cronin <ecronin at gizmolabs.org>:
>
>
> >  I have an HP Pavilion OEM'd HVR-1800 that I'm giving a shot at getting
>  > working (PVR-500 and HDHR are my production analog/digital inputs).
>  >
>  >  I'm running Mythbuntu 8.04 and have tried both with the bundled version of
>  > v4l-dvb modules and a hg copy from April 29, and both have the same problem:
>  >
>  >  The card is detected fine and /dev/dvb/* created.  When I run 'scan
>  > us-Cable-Standard-center-frequencies-QAM256' it detects nothing, even on
>  > frequencies which I know are QAM256 from the HDHR which is 12" of coax away
>  > from the HVR-1800.  Here is an example from the HDHR scan:
>  >
>  >  SCANNING: 759000000 (us-cable:118, us-irc:118)
>  >  LOCK: qam256 (ss=90 snq=52 seq=100)
>  >  PROGRAM: 1: 6.1 WPVI-HD
>  >  PROGRAM: 2: 10.1 WCAU-DT
>  >  PROGRAM: 3: 6.2 WPVI-SD
>  >  PROGRAM: 4: 6.3 WPVI-WX
>  >  PROGRAM: 5: 10.2 WX-PLUS
>  >
>  >  and from 'scan -v test-chan118' which has just 759000000 in it:
>  >
>  >  scanning test-chan118
>  >  using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
>  >  >>> tune to: 759000000:QAM_256
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  WARNING: >>> tuning failed!!!
>  >  >>> tune to: 759000000:QAM_256 (tuning failed)
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  >>> tuning status == 0x00
>  >  WARNING: >>> tuning failed!!!
>  >  ERROR: initial tuning failed
>  >  dumping lists (0 services)
>  >  Done.
>  >
>  >  I have checked the physical connections best I can.  Connecting the
>  > HVR-1800's coax to the PVR-500 sees the analog side of things fine, and the
>  > correct jack on the HVR-1800 is being used.
>  >
>  >  I'm not sure where to go from here debugging things, any suggestions or
>  > more data I can provide?  The modprobe-produced info from dmesg is at the
>  > end of this message.
>
>
>  Eric,
>
>  When you use the scan command to scan for QAM channels, you must
>  specify -a2, to signify that you are scanning digital cable.
>
>  Try that -- does that work?


My bad -- I meant, "-A 2"  (capitol A, space, 2)

-Mike



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