[Alsa-user] Mute sound (not mixer related)

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Hi. Under kernel 2.6.23, I could get sound from the alsa device
created by the module snd_bt87x (it gets sound from my TV card).
Under kernel 2.6.24, there is no sound:
jorge@jorge ~/tmp $ arecord -v -D hw:1,1 -d 10 -f S16_LE teste.wav
Recording WAVE 'teste.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Mono
Warning: rate is not accurate (requested = 8000Hz, got = 119466Hz)
        please, try the plug plugin
Hardware PCM card 1 'Brooktree Bt878' device 1 subdevice 0
Its setup is:
 stream       : CAPTURE
 access       : RW_INTERLEAVED
 format       : S16_LE
 subformat    : STD
 channels     : 1
 rate         : 119466
 exact rate   : 119467 (1792000/15)
 msbits       : 16
 buffer_size  : 59334
 period_size  : 2046
 period_time  : 17126
 tstamp_mode  : NONE
 period_step  : 1
 avail_min    : 2046
 start_threshold  : 1
 stop_threshold   : 59334
 silence_threshold: 0
 silence_size : 0
 boundary     : 1944256512
jorge@jorge ~/tmp $ hexdump -d teste.wav
0000000   18770   17990   28964   00002   16727   17750   28006   08308
0000010   00016   00000   00001   00001   53930   00001   42324   00003
0000020   00002   00016   24932   24948   28928   00002   32767   32767
0000030   32767   32767   32767   32767   32767   32767   32767   32767
*
0027120   32767   32767   32767   32767   32767   32767
002712c

And yes, I have already tried changing mixer settings via alsamixer -c
1. Makes no difference.
Also, in kernel 2.6.23 the device would only appear if I modprobed the
module with the option load_all=1.
In kernel 2.6.24, the option load_all=1 is unnecessary for the device
to appear. This is probably because I have in 2007 sent an email to
alsa-devel with information about my board (it was responded by
Takashi).
For reference, this is the original email:
http://mailman.alsa-project.org/pipermail/alsa-devel/2007-August/002617.html

If you need any addition other than what I provide below, ask at any time.

jorge@jorge ~ $ uname -a
Linux jorge 2.6.24-gentoo-r8d #4 Mon Jun 16 17:58:17 BRT 2008 i686 AMD
Athlon(tm) XP 2600+ AuthenticAMD GNU/Linux

jorge@jorge ~ $ sudo lspci -v
00:00.0 Host bridge: VIA Technologies, Inc. VT8377 [KT400/KT600 AGP] Host Bridge
      Subsystem: VIA Technologies, Inc. Unknown device 0000
      Flags: bus master, 66MHz, medium devsel, latency 8
      Memory at e0000000 (32-bit, prefetchable) [size=128M]
      Capabilities: [a0] AGP version 2.0
      Capabilities: [c0] Power Management version 2

00:01.0 PCI bridge: VIA Technologies, Inc. VT8235 PCI Bridge (prog-if
00 [Normal decode])
      Flags: bus master, 66MHz, medium devsel, latency 0
      Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
      Memory behind bridge: dde00000-dfefffff
      Prefetchable memory behind bridge: cdc00000-ddcfffff
      Capabilities: [80] Power Management version 2

00:07.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8139/8139C/8139C+ (rev 10)
      Subsystem: Realtek Semiconductor Co., Ltd. RT8139
      Flags: bus master, medium devsel, latency 32, IRQ 10
      I/O ports at ec00 [size=256]
      Memory at dfffff00 (32-bit, non-prefetchable) [size=256]
      Capabilities: [50] Power Management version 2
      Kernel driver in use: 8139too

00:0b.0 Multimedia video controller: Brooktree Corporation Bt878 Video
Capture (rev 11)
      Subsystem: PROLINK Microsystems Corp Unknown device 4011
      Flags: bus master, medium devsel, latency 32, IRQ 5
      Memory at dddfe000 (32-bit, prefetchable) [size=4K]
      Capabilities: [44] Vital Product Data <?>
      Capabilities: [4c] Power Management version 2
      Kernel driver in use: bttv
      Kernel modules: bttv

00:0b.1 Multimedia controller: Brooktree Corporation Bt878 Audio
Capture (rev 11)
      Subsystem: PROLINK Microsystems Corp Unknown device 4011
      Flags: bus master, medium devsel, latency 32, IRQ 5
      Memory at dddff000 (32-bit, prefetchable) [size=4K]
      Capabilities: [44] Vital Product Data <?>
      Capabilities: [4c] Power Management version 2
      Kernel driver in use: Bt87x
      Kernel modules: snd-bt87x

00:0c.0 Multimedia audio controller: C-Media Electronics Inc CM8738 (rev 10)
      Subsystem: Micro-Star International Co., Ltd. Unknown device 5900
      Flags: bus master, medium devsel, latency 32, IRQ 11
      I/O ports at e800 [size=256]
      Capabilities: [c0] Power Management version 2
      Kernel driver in use: C-Media PCI
      Kernel modules: snd-cmipci

00:10.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 80) (prog-if 00 [UHCI])
      Subsystem: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller
      Flags: bus master, medium devsel, latency 32, IRQ 11
      I/O ports at dc00 [size=32]
      Capabilities: [80] Power Management version 2
      Kernel driver in use: uhci_hcd

00:10.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 80) (prog-if 00 [UHCI])
      Subsystem: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller
      Flags: bus master, medium devsel, latency 32, IRQ 11
      I/O ports at e000 [size=32]
      Capabilities: [80] Power Management version 2
      Kernel driver in use: uhci_hcd

00:10.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 80) (prog-if 00 [UHCI])
      Subsystem: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller
      Flags: bus master, medium devsel, latency 32, IRQ 5
      I/O ports at e400 [size=32]
      Capabilities: [80] Power Management version 2
      Kernel driver in use: uhci_hcd

00:10.3 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 82)
(prog-if 20 [EHCI])
      Subsystem: VIA Technologies, Inc. USB 2.0
      Flags: bus master, medium devsel, latency 32, IRQ 10
      Memory at dffffe00 (32-bit, non-prefetchable) [size=256]
      Capabilities: [80] Power Management version 2
      Kernel driver in use: ehci_hcd

00:11.0 ISA bridge: VIA Technologies, Inc. VT8235 ISA Bridge
      Subsystem: VIA Technologies, Inc. Unknown device 0000
      Flags: bus master, stepping, medium devsel, latency 0
      Capabilities: [c0] Power Management version 2

00:11.1 IDE interface: VIA Technologies, Inc.
VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)
(prog-if 8a [Master SecP PriP])
      Subsystem: VIA Technologies, Inc.
VT82C586/B/VT82C686/A/B/VT8233/A/C/VT8235 PIPC Bus Master IDE
      Flags: bus master, medium devsel, latency 32, IRQ 255
      [virtual] Memory at 000001f0 (32-bit, non-prefetchable) [size=8]
      [virtual] Memory at 000003f0 (type 3, non-prefetchable) [size=1]
      [virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8]
      [virtual] Memory at 00000370 (type 3, non-prefetchable) [size=1]
      I/O ports at fc00 [size=16]
      Capabilities: [c0] Power Management version 2

01:00.0 VGA compatible controller: nVidia Corporation NV17 [GeForce4
MX 440] (rev a3) (prog-if 00 [VGA controller])
      Flags: bus master, 66MHz, medium devsel, latency 32, IRQ 11
      Memory at de000000 (32-bit, non-prefetchable) [size=16M]
      Memory at d0000000 (32-bit, prefetchable) [size=128M]
      Memory at ddc80000 (32-bit, prefetchable) [size=512K]
      Expansion ROM at dfee0000 [disabled] [size=128K]
      Capabilities: [60] Power Management version 2
      Capabilities: [44] AGP version 2.0

jorge@jorge ~ $ cat /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 8
model name      : AMD Athlon(tm) XP 2600+
stepping        : 1
cpu MHz         : 2133.528
cache size      : 256 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow ts
bogomips        : 4271.41
clflush size    : 32

jorge@jorge /proc/asound $ ls
Bt878  card0  card1  cards  CMI8738  devices  hwdep  oss  pcm  timers  version
jorge@jorge /proc/asound $ cat cards
 0 [CMI8738        ]: CMI8738-MC6 - C-Media CMI8738
                    C-Media CMI8738 (model 55) at 0xe800, irq 11
 1 [Bt878          ]: Bt87x - Brooktree Bt878
                    Brooktree Bt878 at 0xdddff000, irq 5
jorge@jorge /proc/asound $ cat devices
 0: [ 0]   : control
 4: [ 0- 0]: hardware dependent
 8: [ 0- 0]: raw midi
 16: [ 0- 0]: digital audio playback
 17: [ 0- 1]: digital audio playback
 18: [ 0- 2]: digital audio playback
 24: [ 0- 0]: digital audio capture
 26: [ 0- 2]: digital audio capture
 32: [ 1]   : control
 33:        : timer
 56: [ 1- 0]: digital audio capture
 57: [ 1- 1]: digital audio capture
jorge@jorge /proc/asound $ cat hwdep
00-00: OPL3 FM
jorge@jorge /proc/asound $ cat pcm
00-02: CMI8738-MC6 : C-Media PCI IEC958 : playback 1 : capture 1
00-01: CMI8738-MC6 : C-Media PCI 2nd DAC : playback 1
00-00: CMI8738-MC6 : C-Media PCI DAC/ADC : playback 1 : capture 1
01-01: Bt87x Analog : Bt87x Analog : capture 1
01-00: Bt87x Digital : Bt87x Digital : capture 1
jorge@jorge /proc/asound $ cat version
Advanced Linux Sound Architecture Driver Version 1.0.15 (Tue Nov 20
19:16:42 2007 UTC).