[Alsa-user] i8x0: no sound from rear channels

[Peter B. <Pet...@ug...>]

Hi,

I can't seem to get any sound from the rear channels using a 4-channel spea=
ker=20
setup on the sound card on an ASUS P4B533-VM motherboard.

I'm testing my speaker setup with=20
http://www.alsa-project.org/~james/speaker-test/, but the sound sent to the=
=20
rear channels never shows up, except when I enable 'center LFE downmix', in=
=20
which case it gets routed to the front speakes. My 'surround' mixer is=20
unmuted.

I have this setup working in Windows, so wiring should be OK. The rear chan=
nel=20
is connected to line-in.=20

I've fiddled with the other options in alsamixer, but they don't seem to ha=
ve=20
any effect. Strangely enough, 'duplicate-front' and 'line-in as surround'=20
don't have any effect either.

Any help would be much appreciated?

Here are the details:

kernel 2.6.9-gentoo-r1=20

:/proc/asound: cat cards
0 [I82801DBICH4   ]: ICH - Intel 82801DB-ICH4
                     Intel 82801DB-ICH4 at 0xe3800000, irq 10

:/proc/asound: cat card0/intel8x0
Intel8x0

Global control        : 0x00100002
Global status         : 0x00700100
SDM                   : 0x00000008
AC'97 codecs ready    : primary
AC'97 codecs SDIN     : 0 0 0

:cat /proc/pci

  Bus  0, device  31, function  5:
    Multimedia audio controller: Intel Corp. 82801DB/DBL/DBM
(ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 1).
      IRQ 10.
      I/O at 0xa800 [0xa8ff].
      I/O at 0xa400 [0xa43f].
      Non-prefetchable 32 bit memory at 0xe3800000 [0xe38001ff].
      Non-prefetchable 32 bit memory at 0xe3000000 [0xe30000ff].

dmseg
intel8x0_measure_ac97_clock: measured 49294 usecs
intel8x0: clocking to 48000
ALSA device list:
  #0: Intel 82801DB-ICH4 at 0xe3800000, irq 10

Peter