[mythtv] DVB-S tuning failure

[Neil Garratt]

I've upgraded from an older 0.18 head to a fairly recent head [10507],
but I'm picking up a tuning problem on my Nexus-S. Looking at the logs
I can see a tuning attempt is made to the correct frequency and
polarity, it reports success, but it hasn't actually done anything.

In the attached log, it was meant to tune to 11090000/V, but the PAT
shown in the log is from 11010000/V (the mux from startup). Tuning
returns almost immediately with apparent success, but I've confirmed
with other dvb tools that it's still tuned to the old mux.

This only seems to happen with changes between a couple of muxes. If I
switch directly between 11010000/V and 11090000/V I get a tuning
mismatch, but if I switch to 11594000/V in between then it works
correctly.

I'm running kernel 2.6.16.14 with a standard Universal LNB (no other
DiSEqC devices)

I've gone back to the older 0.18 release to make sure it wasn't a
hardware fault, and this version works correctly.


I've had to apply the hack in ticket #1970 to disable the extra PMT
filters, but I don't think this would have any effect on this problem.
I'll have a look at this further when the tuning works correctly (my
card doesn't lock up like the one reported in the ticket, it just
doesn't get any data)

Neil
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zapping to 109 'BBC':
sat 0, frequency using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
status 01 | signal 873a | snr 813f | ber 00006200 | unc 00000000 |
status 1f | signal a3c3 | snr cde0 | ber 00001a00 | unc 00000000 | FE_HAS_LOCK


*********************************************************************************

dvbsnoop V1.3.77 -- http://dvbsnoop.sourceforge.net/

------------------------------------------------------------
SECT-Packet: 00000001   PID: 0 (0x0000), Length: 84 (0x0054)
Time received: Sat 2006-07-15  11:51:17.774
------------------------------------------------------------
  0000:  00 b0 51 00 04 eb 00 00  01 a4 ef aa 01 a9 ef af   ..Q.............
  0010:  01 ae ef a1 01 af ef ab  01 b8 ef a7 01 c2 ef a8   ................
  0020:  01 c7 e8 0d 01 d1 ef a3  01 d6 ef b1 01 e0 ef a5   ................
  0030:  01 ec ef a6 01 ed ef ae  01 ef ef a9 01 f1 ef a0   ................
  0040:  01 f2 ef ad 0c 4c ef ac  0c 4d ef a2 0c 64 ef b0   .....L...M...d..
  0050:  ba 95 cd a0                                        ....

PID:  0 (0x0000)  [Guess table from table id...
PAT-decoding....
Table_ID: 0 (0x00)  [section_syntax_indicator: 1 (0x01)
(fixed): 0 (0x00)
reserved_1: 3 (0x03)
Section_length: 81 (0x0051)
Transport_Stream_ID: 4 (0x0004)
reserved_2: 3 (0x03)
Version_number: 21 (0x15)
current_next_indicator: 1 (0x01)  [Section_number: 0 (0x00)
Last_Section_number: 0 (0x00)

    Program_number: 420 (0x01a4)
    reserved: 7 (0x07)
    Program_map_PID: 4010 (0x0faa)

    Program_number: 425 (0x01a9)
    reserved: 7 (0x07)
    Program_map_PID: 4015 (0x0faf)

    Program_number: 430 (0x01ae)
    reserved: 7 (0x07)
    Program_map_PID: 4001 (0x0fa1)

    Program_number: 431 (0x01af)
    reserved: 7 (0x07)
    Program_map_PID: 4011 (0x0fab)

    Program_number: 440 (0x01b8)
    reserved: 7 (0x07)
    Program_map_PID: 4007 (0x0fa7)

    Program_number: 450 (0x01c2)
    reserved: 7 (0x07)
    Program_map_PID: 4008 (0x0fa8)

    Program_number: 455 (0x01c7)
    reserved: 7 (0x07)
    Program_map_PID: 2061 (0x080d)

    Program_number: 465 (0x01d1)
    reserved: 7 (0x07)
    Program_map_PID: 4003 (0x0fa3)

    Program_number: 470 (0x01d6)
    reserved: 7 (0x07)
    Program_map_PID: 4017 (0x0fb1)

    Program_number: 480 (0x01e0)
    reserved: 7 (0x07)
    Program_map_PID: 4005 (0x0fa5)

    Program_number: 492 (0x01ec)
    reserved: 7 (0x07)
    Program_map_PID: 4006 (0x0fa6)

    Program_number: 493 (0x01ed)
    reserved: 7 (0x07)
    Program_map_PID: 4014 (0x0fae)

    Program_number: 495 (0x01ef)
    reserved: 7 (0x07)
    Program_map_PID: 4009 (0x0fa9)

    Program_number: 497 (0x01f1)
    reserved: 7 (0x07)
    Program_map_PID: 4000 (0x0fa0)

    Program_number: 498 (0x01f2)
    reserved: 7 (0x07)
    Program_map_PID: 4013 (0x0fad)

    Program_number: 3148 (0x0c4c)
    reserved: 7 (0x07)
    Program_map_PID: 4012 (0x0fac)

    Program_number: 3149 (0x0c4d)
    reserved: 7 (0x07)
    Program_map_PID: 4002 (0x0fa2)

    Program_number: 3172 (0x0c64)
    reserved: 7 (0x07)
    Program_map_PID: 4016 (0x0fb0)

CRC: 3130379680 (0xba95cda0)
=============================