[alsa-devel] left/right bleed or crossover
Takashi Iwai
tiwai at suse.de
Tue Jul 3 11:48:19 CEST 2007
At Mon, 2 Jul 2007 16:25:12 -0600,
Howdy Pierce wrote:
>
> I'm encountering the following problem on Fedora Core 6 running on a Dell
> Optiplex 745. This is a pretty vanilla computer with an ICH8 chipset and
> integrated AD1983 sound capabilities.
>
> I have wired up a funky line-input cable so that I have completely separate
> audio sources playing on the left and right inputs.
>
> When I either play these through to the speaker output directly (using
> alsamixer), or record the audio using arecord, the result is that there is a
> slight bit of bleeding or crossover, so I can faintly hear the left input on
> the right channel, and vice versa. If I record a wav file and then play it
> on another computer, the left/right bleeding follows the wav file, so it
> seems that the problem is in the capture process somehow.
>
> When I install Windows XP onto the same machine, the problem disappears, so
> I can rule out hardware errors.
>
> The application I'm working on relies on being able to reliably capture the
> right and left channels of audio independently. Since the problem can be
> seen using the standard arecord/aplay tools, though, I don't think it's my
> code.
>
> I've tried all the possible combinations inside alsamixer, and I don't think
> there's anything I've messed up there.
>
> I've put the relevant system details below. Thanks for any help you can
> provide.
To investigate where the problem exists, try to use "hw" PCM first
without alsa-lib plugins. If the problem still remains, it's in the
driver (that I don't expect since your codec dump looks sane to me).
Takashi
>
> --Howdy
>
> =============================
> Howdy Pierce
> Managing Partner
> Cardinal Peak, LLC
>
> work: (303) 665-3962 x101
> cell: (303) 589-1645
> email: howdy at cardinalpeak.com
> web: www.cardinalpeak.com
> =============================
>
>
> [root at dundee ~]# cat /proc/asound/cards
> 0 [Intel ]: HDA-Intel - HDA Intel
> HDA Intel at 0xdfdfc000 irq 169
>
> [root at dundee ~]# cat /proc/asound/devices
> 2: : timer
> 3: : sequencer
> 4: [ 0- 1]: digital audio playback
> 5: [ 0- 0]: digital audio playback
> 6: [ 0- 0]: digital audio capture
> 7: [ 0] : control
>
> [root at dundee ~]# lspci
> 00:00.0 Host bridge: Intel Corporation 82Q963/Q965 Memory Controller Hub
> (rev 02)
> 00:01.0 PCI bridge: Intel Corporation 82Q963/Q965 PCI Express Root Port (rev
> 02)
> 00:02.0 Display controller: Intel Corporation 82Q963/Q965 Integrated
> Graphics Controller (rev 02)
> 00:02.1 Display controller: Intel Corporation 82Q963/Q965 Integrated
> Graphics Controller (rev 02)
> 00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI #4
> (rev 02)
> 00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI #5
> (rev 02)
> 00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI #2
> (rev 02)
> 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio
> Controller (rev 02)
> 00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port
> 1 (rev 02)
> 00:1c.4 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port
> 5 (rev 02)
> 00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI #1
> (rev 02)
> 00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI #2
> (rev 02)
> 00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI #3
> (rev 02)
> 00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI #1
> (rev 02)
> 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev f2)
> 00:1f.0 ISA bridge: Intel Corporation 82801HB/HR (ICH8/R) LPC Interface
> Controller (rev 02)
> 00:1f.2 IDE interface: Intel Corporation 82801H (ICH8 Family) 4 port SATA
> IDE Controller (rev 02)
> 00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev
> 02)
> 00:1f.5 IDE interface: Intel Corporation 82801H (ICH8 Family) 2 port SATA
> IDE Controller (rev 02)
> 03:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5754 Gigabit
> Ethernet PCI Express (rev 02)
> 04:02.0 VGA compatible controller: nVidia Corporation NV18 [GeForce4 MX 4000
> AGP 8x] (rev c1)
>
> [root at dundee ~]# rpm --query --all | grep alsa
> alsa-lib-1.0.12-2.fc6
> alsa-lib-devel-1.0.12-2.fc6
> alsa-utils-1.0.12-3.fc6
>
> [root at dundee Intel]# cat /proc/asound/Intel/codec#0
> Codec: Analog Devices AD1983
> Address: 0
> Vendor Id: 0x11d41983
> Subsystem Id: 0x102801da
> Revision Id: 0x100400
> Default PCM: rates 0x07f, bits 0x0e, types 0x1
> Default Amp-In caps: N/A
> Default Amp-Out caps: ofs=0x3d, nsteps=0x3f, stepsize=0x05, mute=1
> Node 0x02 [Audio Output] wcaps 0x30311: Stereo Digital
> PCM: rates 0x060, bits 0x02, types 0x5
> Connection: 2
> 0x01* 0x04
> Node 0x03 [Audio Output] wcaps 0x441: Stereo
> Power: 0x0
> Node 0x04 [Audio Input] wcaps 0x100501: Stereo
> Power: 0x0
> Connection: 1
> 0x14
> Node 0x05 [Pin Complex] wcaps 0x400185: Stereo Amp-Out
> Amp-Out caps: ofs=0x3d, nsteps=0x3f, stepsize=0x05, mute=1
> Amp-Out vals: [0x32 0x32]
> Pincap 0x0817: OUT Detect
> Pin Default 0x01014010: [Jack] Line Out at Ext Rear
> Conn = 1/8, Color = Green
> Pin-ctls: 0x40: OUT
> Connection: 2
> 0x03 0x0e*
> Node 0x06 [Pin Complex] wcaps 0x400185: Stereo Amp-Out
> Amp-Out caps: ofs=0x3d, nsteps=0x3f, stepsize=0x05, mute=1
> Amp-Out vals: [0x25 0x25]
> Pincap 0x081f: OUT HP Detect
> Pin Default 0x0221101f: [Jack] HP Out at Ext Front
> Conn = 1/8, Color = Black
> Pin-ctls: 0xc0: OUT HP
> Connection: 2
> 0x03 0x0e*
> Node 0x07 [Pin Complex] wcaps 0x400104: Mono Amp-Out
> Amp-Out caps: ofs=0x3d, nsteps=0x3f, stepsize=0x05, mute=1
> Amp-Out vals: [0x80]
> Pincap 0x0810: OUT
> Pin Default 0x991301f0: [Fixed] Speaker at Int ATAPI
> Conn = ATAPI, Color = Unknown
> Pin-ctls: 0x40: OUT
> Connection: 1
> 0x0f
> Node 0x08 [Pin Complex] wcaps 0x400081: Stereo
> Pincap 0x081727: IN Detect
> Pin Default 0x02a11020: [Jack] Mic at Ext Front
> Conn = 1/8, Color = Black
> Pin-ctls: 0x24: IN
> Node 0x09 [Pin Complex] wcaps 0x400081: Stereo
> Pincap 0x081727: IN Detect
> Pin Default 0x0181302e: [Jack] Line In at Ext Rear
> Conn = 1/8, Color = Blue
> Pin-ctls: 0x20: IN
> Node 0x0a [Pin Complex] wcaps 0x400301: Stereo Digital
> Pincap 0x0810: OUT
> Pin Default 0x414511f0: [N/A] SPDIF Out at Ext Rear
> Conn = Optical, Color = Black
> Pin-ctls: 0x40: OUT
> Connection: 1
> 0x02
> Node 0x0b [Audio Selector] wcaps 0x300101: Stereo
> Connection: 4
> 0x03 0x0c 0x0d 0x0e*
> Node 0x0c [Audio Selector] wcaps 0x30010d: Stereo Amp-Out
> Amp-Out caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0
> Amp-Out vals: [0x00 0x00]
> Connection: 2
> 0x08* 0x09
> Node 0x0d [Audio Selector] wcaps 0x300101: Stereo
> Connection: 2
> 0x09* 0x08
> Node 0x0e [Audio Mixer] wcaps 0x200101: Stereo
> Connection: 3
> 0x11 0x12 0x13
> Node 0x0f [Audio Mixer] wcaps 0x200100: Mono
> Connection: 1
> 0x0b
> Node 0x10 [Beep Generator Widget] wcaps 0x70000c: Mono Amp-Out
> Amp-Out caps: ofs=0x0f, nsteps=0x0f, stepsize=0x0b, mute=1
> Amp-Out vals: [0x80]
> Node 0x11 [Audio Selector] wcaps 0x30010d: Stereo Amp-Out
> Amp-Out caps: ofs=0x17, nsteps=0x1f, stepsize=0x05, mute=1
> Amp-Out vals: [0x97 0x17]
> Connection: 1
> 0x03
> Node 0x12 [Audio Selector] wcaps 0x30010d: Stereo Amp-Out
> Amp-Out caps: ofs=0x17, nsteps=0x1f, stepsize=0x05, mute=1
> Amp-Out vals: [0x80 0x80]
> Connection: 1
> 0x0c
> Node 0x13 [Audio Selector] wcaps 0x30010d: Stereo Amp-Out
> Amp-Out caps: ofs=0x17, nsteps=0x1f, stepsize=0x05, mute=1
> Amp-Out vals: [0x9f 0x9f]
> Connection: 1
> 0x0d
> Node 0x14 [Audio Selector] wcaps 0x30010d: Stereo Amp-Out
> Amp-Out caps: ofs=0x00, nsteps=0x0f, stepsize=0x05, mute=1
> Amp-Out vals: [0x0f 0x0f]
> Connection: 4
> 0x0c 0x0d* 0x0e 0x0f
> Node 0x15 [Power Widget] wcaps 0x500500: Mono
> Power: 0x0
> Connection: 15
> 0x05 0x06* 0x07 0x08 0x09 0x0b 0x0c 0x0d 0x0e 0x0f 0x10 0x11 0x12 0x13
> 0x14
>
>
>
>
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