dvb-c: TT C-1501: tda827x.c: Cannot hold lock at 746 MHz

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Hello,

Klaas patch is not complete:
http://article.gmane.org/gmane.linux.drivers.dvb/47571

I found a hole at 746MHz with 2.6.34.0 kernel and DE provider kabelbw.de,
Picture fragments and audio bursts only:

Oct  2 15:53:03 tom1 vdr: [16380] receiver on device 1 thread ended (pid=16268, tid=16380)
Oct  2 15:53:03 tom1 kernel: tda827x: tda827xa_set_params:
Oct  2 15:53:03 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc
Oct  2 15:53:03 tom1 kernel: tda827x: tda8275a AGC2 gain is: 4
Oct  2 15:53:04 tom1 vdr: [16462] setting audio track to 1 (0)
Oct  2 15:53:04 tom1 kernel: tda827x: tda827xa_set_params:
Oct  2 15:53:04 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc
Oct  2 15:53:04 tom1 kernel: tda827x: tda8275a AGC2 gain is: 5
Oct  2 15:53:04 tom1 vdr: [16279] frontend 0 lost lock on channel 496, tp 746
Oct  2 15:53:04 tom1 vdr: [16279] frontend 0 regained lock on channel 496, tp 746
Oct  2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params:
Oct  2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc
Oct  2 15:53:05 tom1 kernel: tda827x: tda8275a AGC2 gain is: 4
Oct  2 15:53:05 tom1 vdr: [16279] frontend 0 lost lock on channel 496, tp 746
Oct  2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params:
Oct  2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc
Oct  2 15:53:05 tom1 kernel: tda827x: tda8275a AGC2 gain is: 4
Oct  2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params:
Oct  2 15:53:05 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc
Oct  2 15:53:05 tom1 kernel: tda827x: tda8275a AGC2 gain is: 5
Oct  2 15:53:06 tom1 vdr: [16279] frontend 0 regained lock on channel 496, tp 746
Oct  2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params:
Oct  2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc
Oct  2 15:53:06 tom1 kernel: tda827x: tda8275a AGC2 gain is: 5
Oct  2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params:
Oct  2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc
Oct  2 15:53:06 tom1 kernel: tda827x: tda8275a AGC2 gain is: 5
Oct  2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params:
Oct  2 15:53:06 tom1 kernel: tda827x: tda827xa_set_params select tda827xa_dvbc
Oct  2 15:53:06 tom1 kernel: tda827x: tda8275a AGC2 gain is: 4
Oct  2 15:53:06 tom1 vdr: [16268] switching to channel 494

cycle: 78  d_time: 0.004 s  Sig: 51657  SNR: 43690  BER: 1728  UBLK: 55  Stat: 0x00 []
cycle: 79  d_time: 0.004 s  Sig: 52428  SNR: 60395  BER: 1728  UBLK: 57  Stat: 0x03 [SIG CARR ]
cycle: 80  d_time: 0.004 s  Sig: 50886  SNR: 46517  BER: 1728  UBLK: 95  Stat: 0x00 []
cycle: 81  d_time: 0.007 s  Sig: 52428  SNR: 44461  BER: 1728  UBLK: 54  Stat: 0x03 [SIG CARR ]
cycle: 82  d_time: 0.003 s  Sig: 51657  SNR: 61423  BER: 1728  UBLK: 5  Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 83  d_time: 0.237 s  Sig: 40092  SNR: 47288  BER: 1048575  UBLK: 66  Stat: 0x00 []
cycle: 84  d_time: 0.005 s  Sig: 56283  SNR: 45232  BER: 1728  UBLK: 113  Stat: 0x00 []
cycle: 85  d_time: 0.006 s  Sig: 53199  SNR: 46774  BER: 1728  UBLK: 136  Stat: 0x00 []
cycle: 86  d_time: 0.008 s  Sig: 50115  SNR: 44975  BER: 1728  UBLK: 55  Stat: 0x00 []
cycle: 87  d_time: 0.004 s  Sig: 53199  SNR: 53970  BER: 1728  UBLK: 287  Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 88  d_time: 0.020 s  Sig: 50886  SNR: 61166  BER: 1728  UBLK: 62  Stat: 0x03 [SIG CARR ]

Current parameters:
    Frequency:  746000.000 kHz
    Inversion:  ON
    Symbol rate:  6.900000 MSym/s
    FEC:  none
    Modulation:  QAM 64

Card is just bought newly:

00:06.0 0480: 1131:7146 (rev 01)
	Subsystem: 13c2:101a
	Flags: bus master, medium devsel, latency 32, IRQ 17
	Memory at fbeffc00 (32-bit, non-prefetchable) [size=512]
	Kernel driver in use: budget_ci dvb

Other (tested favourite) channels are tuned in fine.

No network problems for this transponder reported in cable provider's support forums.

Anyone got the chips datasheet or a hint what to tweak in the tda827xa_dvbc[] for this frequency?

{ .lomax = 802000000, .svco = 2, .spd = 0, .scr = 2, .sbs = 4, .gc3 = 1}, ?

thx,
Y
tom



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