[mythtv-users] saa7134 vbi problem ?

marek mark_kiddy at wp.pl
Fri Aug 31 05:28:15 UTC 2007

Hi group

i have problem with VBI/Pal teletext in mythtv

Hardware :
geniatech DVB-S (cx88) looks like :
  cx88[0]: subsystem: 14f1:0084, board: Geniatech DVB-S 
  cx88[0]: TV tuner type 4, Radio tuner type -1
  cx88[0]/0: registered device video3 [v4l2]
  cx88[0]/0: registered device vbi3
  cx88/2: cx2388x dvb driver version 0.0.6 loaded
  cx88/2: registering cx8802 driver, type: dvb access: shared
  cx88[0]/2: subsystem: 14f1:0084, board: Geniatech DVB-S [card=52]
  cx88[0]/2: cx2388x based DVB/ATSC card

KNC One TV Station DVR
  saa7134[0]: subsystem: 1894:a006, board: KNC One TV-Station DVR 
  tuner 0-0060: type set to 38 (Philips PAL/SECAM multi (FM1216ME MK3))
  saa6752hs 0-0020: saa6752hs: chip found @ 0x40
  saa7134[0]: registered device video1 [v4l2]
  saa7134[0]: registered device vbi1
  saa7134[0]: registered device radio1
  saa7134 ALSA driver for DMA sound loaded
  saa7134[0]/alsa: saa7134[0] at 0xfdeffc00 irq 17 registered as card 1
  saa7134[0]: registered device video0 [mpeg]

so it looks rather ok.
I can watch, record, switch between channels, inputs, etc
but when I try menu -> toggle teletext menu - see "P100 Page not 
available" on every channel - source independent.
all analog channels have very good signal - when I use tvtime for 
watching analog tv - and alevt for teletext it works without problems 
(but alevt needs patch for using it with saa7134 - without this patch it 
can't decode vbi data - look at this patch here : 
http://marc.info/?l=linux-video&m=104135131408201&w=2), cat /dev/vbi1 
shows data stream..

mythtv-setup has vbi inputs properly configured (for saa7134 /dev/vbi1, 
fuser /dev/vbi1 while watching analog shows /dev/vbi1 is used by 
Logs doesn't show any VBI  problem

Maybe this is sth. wrong with decoding (v4l2 or saa7134 related?) or 
maybe I miss something - how i can debug  this ?

Marek K.

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