DVB-T regressions in recent kernels for el7

Hi: It's a long time since I posted to this list. I'm a long-time user of MythTV, using DVB-T in the UK.

My current Mythbox is running myth-master under Scientific Linux 7, a near-clone of RHEL7, an x86_64 distro. I know that long-lived distros like this are not a prime target for linux-media, but they have some attractions.

I'm currently running a recent but not current stock kernel; it works for me. Later stock kernels don't see the Hauppauge pci DVB-T card and don't identify separately the two tuners in the Kworld usb device. I've also tried later kernels from elrepo, with similar lack of success.

So, I do have a working box, but updating kernels is broken. I'd appreciate suggestions.

I have posted earlier on the MythTV and SL lists, without getting suggestions leading to a solution.

Thanks,

John Pilkington

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This one works:

[john@HP_Box ~]$ uname -r
3.10.0-123.9.3.el7.x86_64
[john@HP_Box ~]$ dmesg | grep adapter

[   12.319211] DVB: registering new adapter (Kworld UB499-2T T09(IT9137))
[   12.939916] usb 2-2: DVB: registering adapter 0 frontend 0 (Kworld UB499-2T T09(IT9137)_1)...
[   12.941371] DVB: registering new adapter (Kworld UB499-2T T09(IT9137))
[   13.584187] usb 2-2: DVB: registering adapter 1 frontend 0 (Kworld UB499-2T T09(IT9137)_2)...
[   16.764033] DVB: registering new adapter (saa7133[0])
[   16.764043] saa7134 0000:07:04.0: DVB: registering adapter 2 frontend 0 (Philips TDA10046H DVB-T)...

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This one, a later stock el7 kernel, doesn't work.

[john@HP_Box ~]$ uname -r
3.10.0-123.13.1.el7.x86_64
john@HP_Box ~]$ dmesg | grep DVB

[    1.556887] saa7133[0]: subsystem: 0070:6700, board: Hauppauge WinTV-HVR1110 DVB-T/Hybrid [card=104,autodetected]
[    1.695217] tveeprom 0-0050: TV standards PAL(B/G) NTSC(M) PAL(I) SECAM(L/L') PAL(D/D1/K) ATSC/DVB Digital (eeprom 0xfc)
[    1.708443] DVB: Unable to find symbol tda10046_attach()  ******
[    1.736049] usb 2-2: Product: DVB-T TV Stick
[    1.845944] DVB: registering new adapter (Kworld UB499-2T T09(IT9137))
[    1.848465] DVB: Unable to find symbol it913x_fe_attach()  ******

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.. and this, a 'testing' kernel, doesn't see the Hauppauge pci device.

[john@HP_Box ~]$ uname -r
3.18.0-1.el7.elrepo.x86_64
[john@HP_Box ~]$ dmesg | grep adapter

[   11.707221] DVB: registering new adapter (Kworld UB499-2T T09)
[   12.054409] usb 2-2: DVB: registering adapter 0 frontend 0 (Afatech AF9033 (DVB-T))...
[   12.343371] DVB: registering new adapter (Kworld UB499-2T T09)
[   12.352152] usb 2-2: DVB: registering adapter 1 frontend 0 (Afatech AF9033 (DVB-T))...

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