Noisy kX front out vs quiet ALSA front out

AstralStorm · May 5, 2004, 06:18 PM

Both kX and Creative drivers output loud noise ( ~ -87 dB ) to front output regardless of AC97 settings.
Is it possible to remove that noise?
ALSA (Linux) driver doesn't produce it.
It isn't Windows-specific, as it doesn't happen if soundcard drivers are disabled.

kX Info:
----Hardware / Software configuration---------------
Nazwa sterownika:kX Audio Driver (Debug)
Data sterownika: Feb 17 2004 00:43:22
Wersja sterownika: 5.10.00.3537 - debug
Nazwa DB:none
CT4670 10k1 [d400]
PCI Information:
Device: 21102 Subsys: 201102 ChipRev: 4
Card has MPU device
Card HAS AC97 codec
Codec name: TriTech TR28023/CT1297
3D Extension: No 3D Stereo Enhancement
Codec is 1.0 compliant
Capabilities[0] :
DAC resolutions : -16-bit-
ADC resolutions : -16-bit-
Ext Capabilities [0]:
Port: d400 Irq: 0x10(16)
Playback buffer: 1ff8
Record buffer: 4000
Number of AC3 buffers: 4
Tank memory: 1024 kb
GSIF buffer: 256 samples
OS version: [2 5 0 Service Pack 4; 2 5 0 Service Pack 4; 156 148]
----------------------------------------------------

ALSA info:
ALSA Audio Debug v0.0.7 - śro maj 5 23:39:20 CEST 2004
http://alsa.opensrc.org/?aadebug

Kernel ----------------------------------------------------
Linux uplink2 2.6.6-rc2-mm1 #4 Sat Apr 24 03:36:24 CEST 2004 i686 AMD Athlon(tm) XP 2400+ AuthenticAMD GNU/Linux

Loaded Modules --------------------------------------------
snd_seq_midi 5568 -
snd_emu10k1_synth 5716 -
snd_emux_synth 29780 -
snd_seq_virmidi 4436 -
snd_seq_midi_emul 5044 -
snd_emu10k1 81092 -
snd_rawmidi 16640 -
snd_ac97_codec 50596 -
snd_util_mem 1780 -
snd_hwdep 6116 -
snd_seq_oss 27936 -
snd_seq_device 4860 -
snd_seq_midi_event 4020 -
snd_seq 39216 -
snd_pcm_oss 43300 -
snd_pcm 66088 -
snd_page_alloc 6820 -
snd_timer 17188 -
snd_mixer_oss 15060 -
snd 34276 -

Modules Conf ----------------------------------------------
# $Header: /home/cvsroot/gentoo-x86/media-sound/alsa-utils/files/alsa-modules.conf-rc,v 1.1 2003/08/05 21:07:55 johnm Exp $
alias char-major-116 snd
alias char-major-14 soundcore
## You need to customise this section for your specific sound card(s)
alias snd-card-0 snd-emu10k1
## alias snd-card-1 snd-ens1371
alias sound-slot-0 snd-card-0
## alias sound-slot-1 snd-card-1
alias sound-service-0-0 snd-mixer-oss
alias sound-service-0-1 snd-seq-oss
alias sound-service-0-3 snd-pcm-oss
alias sound-service-0-8 snd-seq-oss
alias sound-service-0-12 snd-pcm-oss
## alias sound-service-1-0 snd-mixer-oss
## alias sound-service-1-3 snd-pcm-oss
## alias sound-service-1-12 snd-pcm-oss
alias /dev/mixer snd-mixer-oss
alias /dev/dsp snd-pcm-oss
alias /dev/midi snd-seq-oss
options snd cards_limit=1

Proc Asound -----------------------------------------------
Advanced Linux Sound Architecture Driver Version 1.0.4.
Compiled on Apr 24 2004 for kernel 2.6.6-rc2-mm1.
0 [Live ]: EMU10K1 - Sound Blaster Live!
Sound Blaster Live! (rev.4) at 0xd400, irq 5
1: : sequencer
0: [0- 0]: ctl
4: [0- 0]: hardware dependent
8: [0- 0]: raw midi
19: [0- 3]: digital audio playback
26: [0- 2]: digital audio capture
25: [0- 1]: digital audio capture
16: [0- 0]: digital audio playback
24: [0- 0]: digital audio capture
6: [0- 2]: hardware dependent
9: [0- 1]: raw midi
10: [0- 2]: raw midi
33: : timer
00-00: EMU10K1 (FX8010)
00-02: Emux WaveTable
00-00: emu10k1 : EMU10K1 : playback 32 : capture 1
00-01: emu10k1 mic : EMU10K1 MIC : capture 1
00-02: emu10k1 efx : EMU10K1 EFX : capture 1
00-03: emu10k1 : EMU10K1 FX8010 : playback 8

Dev Snd ---------------------------------------------------
controlC0 hwC0D2 midiC0D1 pcmC0D0c pcmC0D1c pcmC0D3p timer
hwC0D0 midiC0D0 midiC0D2 pcmC0D0p pcmC0D2c seq

CPU -------------------------------------------------------
model name : AMD Athlon(tm) XP 2400+
cpu MHz : 2004.746

RAM -------------------------------------------------------
MemTotal: 256384 kB
SwapTotal: 516056 kB

Hardware --------------------------------------------------
0000:00:00.0 Host bridge: nVidia Corporation nForce2 AGP (different version?) (rev c1)
0000:01:0a.0 Multimedia audio controller: Creative Labs SB Live! EMU10k1 (rev 04)

Doomsayer · May 5, 2004, 07:13 PM

I'm pretty sure AC97 is to blame. Try experimenting with the DSP - e.g. disconnect Prolog completely. Also, what about the rear output?

AstralStorm · May 7, 2004, 02:01 PM

Rear output isn't noisy in both configurations.
Disconnecting everything (like cleaning DSP) doesn't help.

I don't know if it's revelant, but ALSA drivers have a weird 'feature': midi is audible only on front output.

Maybe there's some builtin AC97 (noisy) amplifier enabled?
Front output is louder than rear in kX drivers...

May 5, 2004, 06:18 PM	#1
AstralStorm DriverHeaven Newbie Join Date: Apr 2004 Posts: 3 Rep Power: 0	Noisy kX front out vs quiet ALSA front out Both kX and Creative drivers output loud noise ( ~ -87 dB ) to front output regardless of AC97 settings. Is it possible to remove that noise? ALSA (Linux) driver doesn't produce it. It isn't Windows-specific, as it doesn't happen if soundcard drivers are disabled. kX Info: ----Hardware / Software configuration--------------- Nazwa sterownika:kX Audio Driver (Debug) Data sterownika: Feb 17 2004 00:43:22 Wersja sterownika: 5.10.00.3537 - debug Nazwa DB:none CT4670 10k1 [d400] PCI Information: Device: 21102 Subsys: 201102 ChipRev: 4 Card has MPU device Card HAS AC97 codec Codec name: TriTech TR28023/CT1297 3D Extension: No 3D Stereo Enhancement Codec is 1.0 compliant Capabilities[0] : DAC resolutions : -16-bit- ADC resolutions : -16-bit- Ext Capabilities [0]: Port: d400 Irq: 0x10(16) Playback buffer: 1ff8 Record buffer: 4000 Number of AC3 buffers: 4 Tank memory: 1024 kb GSIF buffer: 256 samples OS version: [2 5 0 Service Pack 4; 2 5 0 Service Pack 4; 156 148] ---------------------------------------------------- ALSA info: ALSA Audio Debug v0.0.7 - śro maj 5 23:39:20 CEST 2004 http://alsa.opensrc.org/?aadebug Kernel ---------------------------------------------------- Linux uplink2 2.6.6-rc2-mm1 #4 Sat Apr 24 03:36:24 CEST 2004 i686 AMD Athlon(tm) XP 2400+ AuthenticAMD GNU/Linux Loaded Modules -------------------------------------------- snd_seq_midi 5568 - snd_emu10k1_synth 5716 - snd_emux_synth 29780 - snd_seq_virmidi 4436 - snd_seq_midi_emul 5044 - snd_emu10k1 81092 - snd_rawmidi 16640 - snd_ac97_codec 50596 - snd_util_mem 1780 - snd_hwdep 6116 - snd_seq_oss 27936 - snd_seq_device 4860 - snd_seq_midi_event 4020 - snd_seq 39216 - snd_pcm_oss 43300 - snd_pcm 66088 - snd_page_alloc 6820 - snd_timer 17188 - snd_mixer_oss 15060 - snd 34276 - Modules Conf ---------------------------------------------- # $Header: /home/cvsroot/gentoo-x86/media-sound/alsa-utils/files/alsa-modules.conf-rc,v 1.1 2003/08/05 21:07:55 johnm Exp $ alias char-major-116 snd alias char-major-14 soundcore ## You need to customise this section for your specific sound card(s) alias snd-card-0 snd-emu10k1 ## alias snd-card-1 snd-ens1371 alias sound-slot-0 snd-card-0 ## alias sound-slot-1 snd-card-1 alias sound-service-0-0 snd-mixer-oss alias sound-service-0-1 snd-seq-oss alias sound-service-0-3 snd-pcm-oss alias sound-service-0-8 snd-seq-oss alias sound-service-0-12 snd-pcm-oss ## alias sound-service-1-0 snd-mixer-oss ## alias sound-service-1-3 snd-pcm-oss ## alias sound-service-1-12 snd-pcm-oss alias /dev/mixer snd-mixer-oss alias /dev/dsp snd-pcm-oss alias /dev/midi snd-seq-oss options snd cards_limit=1 Proc Asound ----------------------------------------------- Advanced Linux Sound Architecture Driver Version 1.0.4. Compiled on Apr 24 2004 for kernel 2.6.6-rc2-mm1. 0 [Live ]: EMU10K1 - Sound Blaster Live! Sound Blaster Live! (rev.4) at 0xd400, irq 5 1: : sequencer 0: [0- 0]: ctl 4: [0- 0]: hardware dependent 8: [0- 0]: raw midi 19: [0- 3]: digital audio playback 26: [0- 2]: digital audio capture 25: [0- 1]: digital audio capture 16: [0- 0]: digital audio playback 24: [0- 0]: digital audio capture 6: [0- 2]: hardware dependent 9: [0- 1]: raw midi 10: [0- 2]: raw midi 33: : timer 00-00: EMU10K1 (FX8010) 00-02: Emux WaveTable 00-00: emu10k1 : EMU10K1 : playback 32 : capture 1 00-01: emu10k1 mic : EMU10K1 MIC : capture 1 00-02: emu10k1 efx : EMU10K1 EFX : capture 1 00-03: emu10k1 : EMU10K1 FX8010 : playback 8 Dev Snd --------------------------------------------------- controlC0 hwC0D2 midiC0D1 pcmC0D0c pcmC0D1c pcmC0D3p timer hwC0D0 midiC0D0 midiC0D2 pcmC0D0p pcmC0D2c seq CPU ------------------------------------------------------- model name : AMD Athlon(tm) XP 2400+ cpu MHz : 2004.746 RAM ------------------------------------------------------- MemTotal: 256384 kB SwapTotal: 516056 kB Hardware -------------------------------------------------- 0000:00:00.0 Host bridge: nVidia Corporation nForce2 AGP (different version?) (rev c1) 0000:01:0a.0 Multimedia audio controller: Creative Labs SB Live! EMU10k1 (rev 04)

May 5, 2004, 07:13 PM	#2
Doomsayer DriverHeaven Lover Join Date: Feb 2004 Location: Latvia Posts: 154 Rep Power: 0	I'm pretty sure AC97 is to blame. Try experimenting with the DSP - e.g. disconnect Prolog completely. Also, what about the rear output?

May 7, 2004, 02:01 PM	#3
AstralStorm DriverHeaven Newbie Join Date: Apr 2004 Posts: 3 Rep Power: 0	Rear output isn't noisy in both configurations. Disconnecting everything (like cleaning DSP) doesn't help. I don't know if it's revelant, but ALSA drivers have a weird 'feature': midi is audible only on front output. Maybe there's some builtin AC97 (noisy) amplifier enabled? Front output is louder than rear in kX drivers...