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pinnacle pctv, can't tune since 2.6.10 (reverting bttv to 2.6.9's version fixes problem)

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Hi,

I have the following card (using it in France , SECAM) :
0000:00:0c.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture (rev 11)
Subsystem: Pinnacle Systems Inc. PCTV pro (TV + FM stereo receiver)
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (4000ns min, 10000ns max)
Interrupt: pin A routed to IRQ 185
Region 0: Memory at f4b00000 (32-bit, prefetchable) [size=4K]
Capabilities: [44] Vital Product Data
Capabilities: [4c] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-


0000:00:0c.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev 11)
Subsystem: Pinnacle Systems Inc. PCTV pro (TV + FM stereo receiver, audio section)
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (1000ns min, 63750ns max)
Interrupt: pin A routed to IRQ 185
Region 0: Memory at f4c00000 (32-bit, prefetchable) [size=4K]
Capabilities: [44] Vital Product Data
Capabilities: [4c] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-


since 2.6.10 (till 2.6.11-rc2-mm2 tested last night), I can't change channels in any tv application.
dmesg shows things like :
Jan 30 06:03:55 localhost kernel: mt2032_set_if_freq failed with -121
Jan 30 06:03:56 localhost kernel: mt2032_set_if_freq2 failed with -121
Jan 30 06:03:56 localhost kernel: mt2032_set_if_freq failed with -121


I have heard that other french people has the same problem and also saw someone with a similar bug a few days ago on this list (with a mt2050 this time).

I've hacked a 2.6.10 to work by reverting all bttv's related changes between 2.6.9 and 2.6.10, so it seems the bug have been introduced between these 2 kernels.

I'll be pleased to test any proposed patch, I already looked quite a lot at the patch I used to revert the changes but was not able to find the reason of the bug ...

Cheers,
Mik

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