On Tue, 2003-12-09 at 02:21, Sergey Vlasov wrote:
> On Mon, Dec 08, 2003 at 08:08:37PM -0800, Mark Knecht wrote:
> > On Mon, 2003-12-08 at 13:04, Sergey Vlasov wrote:
> >
> > > Most likely you need the dxs_support option instead of ac97_clock.
> > >
> > > With dxs_support=2 the sound should work fine, but the hardware mixing
> > > capability will be disabled. Then you can try dxs_support=1 or
> > > dxs_support=4.
> > >
> > > By default snd-via82xx uses dxs_support=3 (except for certain known
> > > motherboards), this makes only 48000 sampling rate available. The
> > > ALSA library can perform resampling for ALSA apps, and the kernel OSS
> > > emulation layer can do resampling for OSS apps, but the quality is
> > > often not good.
> >
> > Sergey,
> > Thanks for sending me down this path. Definitely I'm getting better
> > results now. I did find some things out though. Some may possibly be
> > bugs:
> >
> > 1) On my system dxs_support=3 is NOT the same as not setting dxs_support
> > at all. With dxs_support not set I get horrible results. With
> > dxs_support=3 I get reasonable to good results.
>
> This means that you board in known to the driver...
>
> There is an entry for a similar model in the driver:
>
> { .vendor = 0x1458, .device = 0xa002, .action = VIA_DXS_ENABLE }, /* Gigabyte
> GA-7VAXP */
>
> The IDs checked here are the PCI subsystem vendor/device ID of the sound
> device. Run "lspci -v" and find "Multimedia audio controller" in the
> output, then look at the "Subsystem:" line. The vendor ID will probably
> be replaced by the corresponding name; you can find out the number by
> executing a command like "lspci -nv -s 00:07.5" (use the slot number for
> your audio controller which is shown in the lspci output).
>
> > 2) **ALL** applications I tried (alspalayer, gxine & xmms) are
> > overdriving the audio path somewhere and causing distortion. The output
> > level from the motherboard is not hot. In fact, even when the apps are
> > up full the output level is actually down about 12-15db from where I'd
> > like it, but I'm getting lots of distortion. When I reduce alsaplayer's
> > level the distortion mostly goes away, although I'm left with
> > considerable background hiss. In all cases I monitored the return level
> > and it never causes my inputs to clip. (This level difference may be a
> > pro equipment/consumer equipment issue.)
> >
> > 3) With dxs_support=1 I get very bad sounding results. It appears that
> > there is a bug in the ADC setting. PCM ADC is set to 48K. I think this
> > is the mode I would really like to use if PCM ADC was set to 44.1K, but
> > as it is it sounds terrible. dxs=2 is not very good, and dxs=3/4 are
> > both pretty good. All modes have a lot of hiss compared to my HDP 9652
> > and outboard D/A. (Expected...)
> >
> >
> > cat /proc/asound/card0/codec97#0/ac97#0-0
> >
> > dxs=1 dxs=2 dxs=3/4
> > <SNIP>
> > PCM front DAC : 44100Hz 22050Hz 48000Hz
> > PCM Surr DAC : 44100Hz 22050Hz 48000Hz
> > PCM LFE DAC : 44100Hz 22050Hz 48000Hz
> > PCM ADC : 48000Hz 22050Hz 48000Hz
> > SPDIF Control : 44.1kHz 44.1kHz 48000Hz
> >
> > Sound Quality: BAD!! not good Good
> >
> > So, I am currently using Mode 4 and getting pretty good results,
> > although I think Mode 1 would be even better for me if the PCM ADC was
> > set to the right value.
>
> Something strange is going on here...
>
> With dxs_support=1, the PCM DAC frequencies are set to match the mode
> requested by the software. Probably the VRA support in the onboard codec
> is not very good.
>
> Please show the complete contents of
> /proc/asound/card0/codec97#0/ac97#0-0.
The attached file has the output you asked for for all 5 possibilities,
none, 0,1,2,3. However, the 'none' setting was actually
option snd-via82xx dxs_support
with no number following, instead of no option statement at all. The
sound was the same bad sound, so I think this was probably not an issue.
I am disappointed that there is no option to set the PCM ADC to 44100 in
dxs_support=1. Is that something that could be changed in a future rev,
as in dxs_support=5 ? Since I work 100% of the time in 44100 it would
seem that this is requiring me to resample.
Thanks,
Mark
dxs_support=not set at all
Wizard root # !cat
cat /proc/asound/card0/codec97#0/ac97#0-0
0-0/0: Realtek ALC650 rev 2
Capabilities :
DAC resolution : 20-bit
ADC resolution : 18-bit
3D enhancement : Realtek 3D Stereo Enhancement
Current setup
Mic gain : +0dB [+0dB]
POP path : pre 3D
Sim. stereo : off
3D enhancement : off
Loudness : off
Mono output : MIX
Mic select : Mic1
ADC/DAC loopback : off
Extended ID : codec=0 rev=1 LDAC SDAC CDAC DSA=0 SPDIF DRA VRA
Extended status : SPCV LDAC SDAC CDAC SPDIF=res SPDIF VRA
PCM front DAC : 48000Hz
PCM Surr DAC : 48000Hz
PCM LFE DAC : 48000Hz
PCM ADC : 48000Hz
SPDIF Control : Consumer PCM Category=0x2 Generation=1 Rate=48kHz
SPDIF In Status : Not Locked
Wizard root #
dxs_support=1
Wizard root # !cat
cat /proc/asound/card0/codec97#0/ac97#0-0
0-0/0: Realtek ALC650 rev 2
Capabilities :
DAC resolution : 20-bit
ADC resolution : 18-bit
3D enhancement : Realtek 3D Stereo Enhancement
Current setup
Mic gain : +0dB [+0dB]
POP path : pre 3D
Sim. stereo : off
3D enhancement : off
Loudness : off
Mono output : MIX
Mic select : Mic1
ADC/DAC loopback : off
Extended ID : codec=0 rev=1 LDAC SDAC CDAC DSA=0 SPDIF DRA VRA
Extended status : LDAC SDAC CDAC SPDIF=res SPDIF VRA
PCM front DAC : 44100Hz
PCM Surr DAC : 44100Hz
PCM LFE DAC : 44100Hz
PCM ADC : 48000Hz
SPDIF Control : Consumer PCM Category=0x2 Generation=1 Rate=44.1kHz
SPDIF In Status : Not Locked
Wizard root #
dxs_support=2
Wizard root # !cat
cat /proc/asound/card0/codec97#0/ac97#0-0
0-0/0: Realtek ALC650 rev 2
Capabilities :
DAC resolution : 20-bit
ADC resolution : 18-bit
3D enhancement : Realtek 3D Stereo Enhancement
Current setup
Mic gain : +0dB [+0dB]
POP path : pre 3D
Sim. stereo : off
3D enhancement : off
Loudness : off
Mono output : MIX
Mic select : Mic1
ADC/DAC loopback : off
Extended ID : codec=0 rev=1 LDAC SDAC CDAC DSA=0 SPDIF DRA VRA
Extended status : LDAC SDAC CDAC SPDIF=res VRA
PCM front DAC : 22050Hz
PCM Surr DAC : 22050Hz
PCM LFE DAC : 22050Hz
PCM ADC : 22050Hz
SPDIF Control : Consumer PCM Category=0x2 Generation=1 Rate=44.1kHz
SPDIF In Status : Not Locked
Wizard root #
dxs_support=4
Wizard root # !cat
cat /proc/asound/card0/codec97#0/ac97#0-0
0-0/0: Realtek ALC650 rev 2
Capabilities :
DAC resolution : 20-bit
ADC resolution : 18-bit
3D enhancement : Realtek 3D Stereo Enhancement
Current setup
Mic gain : +0dB [+0dB]
POP path : pre 3D
Sim. stereo : off
3D enhancement : off
Loudness : off
Mono output : MIX
Mic select : Mic1
ADC/DAC loopback : off
Extended ID : codec=0 rev=1 LDAC SDAC CDAC DSA=0 SPDIF DRA VRA
Extended status : SPCV LDAC SDAC CDAC SPDIF=res SPDIF VRA
PCM front DAC : 48000Hz
PCM Surr DAC : 48000Hz
PCM LFE DAC : 48000Hz
PCM ADC : 48000Hz
SPDIF Control : Consumer PCM Category=0x2 Generation=1 Rate=48kHz
SPDIF In Status : Not Locked
Wizard root #
dxs_support=4
Wizard root # !cat
cat /proc/asound/card0/codec97#0/ac97#0-0
0-0/0: Realtek ALC650 rev 2
Capabilities :
DAC resolution : 20-bit
ADC resolution : 18-bit
3D enhancement : Realtek 3D Stereo Enhancement
Current setup
Mic gain : +0dB [+0dB]
POP path : pre 3D
Sim. stereo : off
3D enhancement : off
Loudness : off
Mono output : MIX
Mic select : Mic1
ADC/DAC loopback : off
Extended ID : codec=0 rev=1 LDAC SDAC CDAC DSA=0 SPDIF DRA VRA
Extended status : SPCV LDAC SDAC CDAC SPDIF=res SPDIF VRA
PCM front DAC : 48000Hz
PCM Surr DAC : 48000Hz
PCM LFE DAC : 48000Hz
PCM ADC : 48000Hz
SPDIF Control : Consumer PCM Category=0x2 Generation=1 Rate=48kHz
SPDIF In Status : Not Locked
Wizard root #
