pcm0 channel dead

[Pyun YongHyeon]

On Thu, Jun 16, 2005 at 03:18:30PM -0300, Patrick Tracanelli wrote:
 > 
 > >	Hi,
 > >	I guess what you are saying is the your device is half-duplex.
 > >
 > >	Please do a 
 > >	sysctl hw.snd.verbose=3
 > >  	cat /dev/sndstat
 > >
 > >	--Mat
 > 
 > Here is the output
 > 
 > (eksffa at claire-redfield)~# sysctl hw.snd.verbose=3
 > hw.snd.verbose: 1 -> 3
 > (eksffa at claire-redfield)~# cat /dev/sndstat
 > FreeBSD Audio Driver (newpcm)
 > Installed devices:
 > pcm0: <Acer Labs M5451> at io 0x8800 irq 11  (4p/1r/0v channels duplex 
 > default)
 >         [pcm0:record:0]: spd 8000, fmt 0x00000001/0x00000008, flags 
 > 0x00000000, 0x000000
 > 00
 >         interrupts 0, overruns 0, hfree 256, sfree 131072
 >         {hardware} -> feeder_root(0x00000008) -> 
 > feeder_u8toulaw(0x00000008 -> 0x0000000
 > 1) -> {userland}

Hmm, I think capture mode works ok.

 >         [pcm0:play:0]: spd 44100/44097, fmt 0x10000010, flags 
 > 0x00003030, 0x00000000, pi
 > d 657
 >         interrupts 5793, underruns 2, ready 131072
                            ^^^^^^^^^^^
This is error condition, playback channel 0 has DMA underruns.

 >         {userland} -> feeder_root(0x10000010) -> {hardware}
 >         [pcm0:play:1]: spd 22050/22042, fmt 0x10000010, flags 
 > 0x00000000, 0x00000000
 >         interrupts 0, underruns 0, ready 0
 >         {userland} -> feeder_root(0x10000010) -> {hardware}
 >         [pcm0:play:2]: spd 0, fmt 0x00000000/0x00000008, flags 
 > 0x00000000, 0x00000000
 >         interrupts 0, underruns 0, ready 0
 >         {userland} -> feeder_root(0x00000000) -> {hardware}
 >         [pcm0:play:3]: spd 0, fmt 0x00000000/0x00000008, flags 
 > 0x00000000, 0x00000000
 >         interrupts 0, underruns 0, ready 0
 >         {userland} -> feeder_root(0x00000000) -> {hardware}

What I can't understand is why other playback channel(channel1,
channel 2) is active, though not triggered to play. Normally you
will use one capture/playback channel.
I have no idea how you can see "capture channel dead" as the
above output indicates playback problem.

-- 
Regards,
Pyun YongHyeon
http://www.kr.freebsd.org/~yongari	|	yongari at freebsd.org