Re: ALC883 recording troubles...

At Mon, 9 Jun 2008 20:59:00 +0100,
Daniel J Blueman wrote:

Hi Takashi-san,

I'm experiencing DC offset with the microphone on 2.6.24 (Ubuntu 8.04
LTS x86-64). I can see on Audacity that the DC offset that varies with
the recording capture level.

Could you elaborate? The mic bias level could be changed via the pin
control value. Usually, it's set as VREF 80%.

Plus, the mixer playback->mic-boost
muting enables/disables mic-boost in recording.

This is a known bug in alsa-lib mixer abstraction. No kernel issue.

It feels like the ALC883 pins aren't configured quite right. The mobo
is an Asus P5E-VM with current BIOS [1]

What's the routine to debug this? Would it help to install windows,
dump the register space and compare?

You can find *.INI file that contains the default pin configuration
in Windows. This might be useful in the case BIOS is broken but
Windows does a black magic.

Anyway, please run alsa-info.sh with --no-upload option and show the
generated file here. It contains the codec information and mixer
setup.
http://hg.alsa-project.org/alsa/raw-file/tip/alsa-info.sh

Also, you can adjust the pin setting on the fly via hda-verb utility
below:
http://ftp.suse.com/pub/people/tiwai/misc/hda-verb-0.2.tar.bz2

Don't forget to build snd-hda-intel module with
CONFIG_SND_HDA_HWDEP=y to use this command.


Takashi


Thanks in advance,
Daniel

--- [1]

$ sudo lspci -vvvxxxs 0:1b.0
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio
Controller (rev 02)
Subsystem: ASUSTeK Computer Inc. Unknown device 829f
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size: 32 bytes
Interrupt: pin A routed to IRQ 22
Region 0: Memory at fe9f8000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [60] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
Address: 0000000000000000 Data: 0000
Capabilities: [70] Express Unknown type IRQ 0
Device: Supported: MaxPayload 128 bytes, PhantFunc 0, ExtTag-
Device: Latency L0s <64ns, L1 <1us
Device: Errors: Correctable- Non-Fatal- Fatal- Unsupported-
Device: RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+
Device: MaxPayload 128 bytes, MaxReadReq 128 bytes
Link: Supported Speed unknown, Width x0, ASPM unknown, Port 0
Link: Latency L0s <64ns, L1 <1us
Link: ASPM Disabled CommClk- ExtSynch-
Link: Speed unknown, Width x0
00: 86 80 3e 29 06 00 10 00 02 00 03 04 08 00 00 00
10: 04 80 9f fe 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 43 10 9f 82
30: 00 00 00 00 50 00 00 00 00 00 00 00 0f 01 00 00
40: 01 00 00 07 00 00 00 00 00 00 00 00 00 00 00 00
50: 01 60 42 c8 00 00 00 00 00 00 00 00 00 00 00 00
60: 05 70 80 00 00 00 00 00 00 00 00 00 00 00 00 00
70: 10 00 91 00 00 00 00 10 00 08 10 00 00 00 00 00
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 04 00 01 00 00 00 00 31 00 a3 02 00 00 00 00
d0: 61 00 a3 02 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f0: 00 00 00 00 00 00 00 00 86 0f 02 00 00 00 00 00

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC883 Analog [ALC883 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 1: ALC883 Digital [ALC883 Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 3: ATI HDMI [ATI HDMI]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 2: HDMI [HDA ATI HDMI], device 3: ATI HDMI [ATI HDMI]
Subdevices: 1/1
Subdevice #0: subdevice #0
daniel@veyron:~$ aplay -L
default:CARD=Intel
HDA Intel, ALC883 Analog
Default Audio Device
front:CARD=Intel,DEV=0
HDA Intel, ALC883 Analog
Front speakers
surround40:CARD=Intel,DEV=0
HDA Intel, ALC883 Analog
4.0 Surround output to Front and Rear speakers
surround41:CARD=Intel,DEV=0
HDA Intel, ALC883 Analog
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Intel,DEV=0
HDA Intel, ALC883 Analog
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=Intel,DEV=0
HDA Intel, ALC883 Analog
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=Intel,DEV=0
HDA Intel, ALC883 Analog
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
null
Discard all samples (playback) or generate zero samples (capture)
default:CARD=U0x46d0x990
USB Device 0x46d:0x990, USB Audio
Default Audio Device
front:CARD=U0x46d0x990,DEV=0
USB Device 0x46d:0x990, USB Audio
Front speakers
surround40:CARD=U0x46d0x990,DEV=0
USB Device 0x46d:0x990, USB Audio
4.0 Surround output to Front and Rear speakers
surround41:CARD=U0x46d0x990,DEV=0
USB Device 0x46d:0x990, USB Audio
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=U0x46d0x990,DEV=0
USB Device 0x46d:0x990, USB Audio
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=U0x46d0x990,DEV=0
USB Device 0x46d:0x990, USB Audio
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=U0x46d0x990,DEV=0
USB Device 0x46d:0x990, USB Audio
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=U0x46d0x990,DEV=0
USB Device 0x46d:0x990, USB Audio
IEC958 (S/PDIF) Digital Audio Output
front:CARD=HDMI
HDA ATI HDMI
Front speakers
surround40:CARD=HDMI
HDA ATI HDMI
4.0 Surround output to Front and Rear speakers
surround41:CARD=HDMI
HDA ATI HDMI
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=HDMI
HDA ATI HDMI
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=HDMI
HDA ATI HDMI
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=HDMI
HDA ATI HDMI
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
--
Daniel J Blueman

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