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Old 12-02-2007, 12:12 PM   #1
Registered: Oct 2003
Distribution: Debian GNU/Linux buster 10.4 (amd64) w/kernel 5.7.5
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Question Problems with audio link between BT878 tuner and HDA audio in 2.6.23

I've been beating my head against the wall for the past hour trying to figure out an issue with the audio link between a BT878-derived card (a Leadtek TV2000 XP with a Ymec TVision TVF-5533MF tuner-in-a-can) and an Intel HDA audio stack (an Analog Devices AD1988B on an Asus M2N32-SLI Deluxe) using the 2.6.23 kernel.

The M2N32-SLI has a four-pin auxiliary connector on the motherboard labeled CD, which the snd-intel-hda ALSA driver maps to the capture source 'CD'. I used the included cable to connect the auxiliary connector on the motherboard to its counterpart on the tuner. Despite using alsamixer to select 'CD' as an input source and then unmuting and activating/deactivating capture mode on the relevant mixer control, I can't get any sound whatsoever using either a sound recording utility or a TV application such as tvtime (which otherwise works perfectly).

Output from dmesg:

Linux video capture interface: v2.00
bttv: driver version 0.9.17 loaded
bttv: using 8 buffers with 2080k (520 pages) each for capture
bttv: Bt8xx card found (0).
ACPI: PCI Interrupt Link [APC3] enabled at IRQ 18
ACPI: PCI Interrupt 0000:01:08.0[A] -> Link [APC3] -> GSI 18 (level, low) -> IRQ 18
bttv0: Bt878 (rev 17) at 0000:01:08.0, irq: 18, latency: 32, mmio: 0xfbfff000
bttv0: detected: Leadtek TV 2000 XP [card=34], PCI subsystem ID is 107d:6609
bttv0: using: Leadtek WinFast 2000/ WinFast 2000 XP [card=34,autodetected]
bttv0: gpio: en=00000000, out=00000000 in=003ff502 [init]
bttv0: tuner type=59
bttv0: i2c: checking for MSP34xx @ 0x80... not found
bttv0: i2c: checking for TDA9875 @ 0xb0... not found
bttv0: i2c: checking for TDA7432 @ 0x8a... not found
tuner 2-0061: chip found @ 0xc2 (bt878 #0 [sw])
tuner 2-0061: type set to 59 (Ymec TVision TVF-5533MF)
tuner 2-0061: type set to 59 (Ymec TVision TVF-5533MF)
bttv0: registered device video0
bttv0: registered device vbi0
bttv0: registered device radio0
bttv0: PLL: 28636363 => 35468950 .. ok
input: bttv IR (card=34) as /devices/pci0000:00/0000:00:0e.0/0000:01:08.0/input/input5
Advanced Linux Sound Architecture Driver Version 1.0.14 (Fri Jul 20 09:12:58 2007 UTC). is the output of an info-gathering script published by Gruemaster; it contains the relevant userspace-displayed ALSA information for the M2N32-SLI's sound configuration.

Does anyone know what the problem may be? I'm guessing that the lack of any BT878-linked audio drivers being loaded by the kernel and the lack of any mixers on the card being exposed in the ALSA API may have something to do with the current problem.
Old 12-20-2007, 12:15 AM   #2
Registered: Sep 2004
Location: Melbourne, Victoria Australia
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the 4 pin cd connector is accepts plain analgoue signals

to confirm sound is actually leaving the tv card you can use this test.

hook a small speaker directly to the output on the tv card.

does a real cdrom drive work on this port?


alsa, bt878, hda, intel, kernel, sound, television, tuner, tvtime

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