rc2 stereo problem with via8233

rc2 stereo problem with via8233

[John Covici]

Hi.  With kernel 2.4.18 if I use the rc2 drivers, the PCM does not
play the right channel, when I went back to rc1 it worked fine
without any changes to my asound.state file.  The cd plays right
channel in rc2 and rc1.

-- 
         John Covici
         covici@ccs.covici.com


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Re: rc2 stereo problem with via8233

[Takashi Iwai]

At Tue, 25 Jun 2002 14:12:15 -0400,
John Covici wrote:
> 
> Hi.  With kernel 2.4.18 if I use the rc2 drivers, the PCM does not
> play the right channel, when I went back to rc1 it worked fine
> without any changes to my asound.state file.  The cd plays right
> channel in rc2 and rc1.

i guess you're using via8233 or 8233C, not 8233A, right?
please check lspci.  there are different chip models of via8233,
and each of them is different a bit.

actually, the code of via8233 driver was changed since rc1, to support
via8233a chip.  now it uses the multi-channel playback mode, which is
available on all chips.

does the problem happen on a stereo sample, or on a mono sample?
could you check the difference of formats and channels?


thanks,

Takashi


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Re: rc2 stereo problem with via8233

[Takashi Iwai]

Hi,

At Wed, 26 Jun 2002 16:44:58 -0400,
John covici wrote:
> 
> Here is what I get from the lspci -- I don't think that the via8233
> is multi-channel at all and I didn't see any controls to utilize such
> a thing in my asound.state file.

in fact via8233 has capability to output up to 6 channels (and spdif),
although most of motherboards have only two output channels.

the difference is only the implementation of the driver, so no change
will appear on /etc/asound.state.
the channels are configured dynamically according to the requested
channels of pcm.


> 00:11.5 Multimedia audio controller: VIA Technologies, Inc. AC97 Audio
> Controller (rev 30)
> 
> I can send you the verbose version if that would help.
> 

yes, could you get more detailed info with -xvv and -nvv options?

and, please recheck under which condition this happens,
whether with the stereo samples or with the mono samples, or
whatever.

i can revert the codes only for certain chip models.
since via8233 has _only_ multi-channel playback mode, it must use
this.  but other chip models have another mode, which was used by the
old driver.  this can be enabled conditionally by checking the chip
revision number.


Takashi


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Re: rc2 stereo problem with via8233

[John covici]

OK, here is -xvv for that controller.

00:11.5 Multimedia audio controller: VIA Technologies, Inc. AC97 Audio Controller (rev 30)
	Subsystem: VIA Technologies, Inc.: Unknown device 4511
	Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
	Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
	Interrupt: pin C routed to IRQ 11
	Region 0: I/O ports at ec00 [size=256]
	Capabilities: [c0] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
00: 06 11 59 30 01 00 10 02 30 00 01 04 00 00 00 00
10: 01 ec 00 00 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 06 11 11 45
30: 00 00 00 00 c0 00 00 00 00 00 00 00 0b 03 00 00

and here is the -nvv
00:11.5 Class 0401: 1106:3059 (rev 30)
	Subsystem: 1106:4511
	Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
	Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
	Interrupt: pin C routed to IRQ 11
	Region 0: I/O ports at ec00 [size=256]
	Capabilities: [c0] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-

When I was using it, a stereo sample did play on both channels, from
the cd, from pcm, they were mono -- I didn't test with stereo for the
pcm.  Is this sound card a multi channel and if so, how do I use more
than one channel?



on Thursday 06/27/2002 Takashi Iwai(tiwai@suse.de) wrote
 > Hi,
 > 
 > At Wed, 26 Jun 2002 16:44:58 -0400,
 > John covici wrote:
 > > 
 > > Here is what I get from the lspci -- I don't think that the via8233
 > > is multi-channel at all and I didn't see any controls to utilize such
 > > a thing in my asound.state file.
 > 
 > in fact via8233 has capability to output up to 6 channels (and spdif),
 > although most of motherboards have only two output channels.
 > 
 > the difference is only the implementation of the driver, so no change
 > will appear on /etc/asound.state.
 > the channels are configured dynamically according to the requested
 > channels of pcm.
 > 
 > 
 > > 00:11.5 Multimedia audio controller: VIA Technologies, Inc. AC97 Audio
 > > Controller (rev 30)
 > > 
 > > I can send you the verbose version if that would help.
 > > 
 > 
 > yes, could you get more detailed info with -xvv and -nvv options?
 > 
 > and, please recheck under which condition this happens,
 > whether with the stereo samples or with the mono samples, or
 > whatever.
 > 
 > i can revert the codes only for certain chip models.
 > since via8233 has _only_ multi-channel playback mode, it must use
 > this.  but other chip models have another mode, which was used by the
 > old driver.  this can be enabled conditionally by checking the chip
 > revision number.
 > 
 > 
 > Takashi

-- 
         John Covici
         covici@ccs.covici.com


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Re: rc2 stereo problem with via8233

[Takashi Iwai]

At Thu, 27 Jun 2002 10:14:41 -0400,
John covici wrote:
> 
> OK, here is -xvv for that controller.
> 
> 00:11.5 Multimedia audio controller: VIA Technologies, Inc. AC97 Audio Controller (rev 30)
> 	Subsystem: VIA Technologies, Inc.: Unknown device 4511
> 	Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
> 	Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
> 	Interrupt: pin C routed to IRQ 11
> 	Region 0: I/O ports at ec00 [size=256]
> 	Capabilities: [c0] Power Management version 2
> 		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
> 		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
> 00: 06 11 59 30 01 00 10 02 30 00 01 04 00 00 00 00
> 10: 01 ec 00 00 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 06 11 11 45
> 30: 00 00 00 00 c0 00 00 00 00 00 00 00 0b 03 00 00
> 
> and here is the -nvv
> 00:11.5 Class 0401: 1106:3059 (rev 30)
> 	Subsystem: 1106:4511
> 	Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
> 	Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
> 	Interrupt: pin C routed to IRQ 11
> 	Region 0: I/O ports at ec00 [size=256]
> 	Capabilities: [c0] Power Management version 2
> 		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
> 		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
 
thanks.


> When I was using it, a stereo sample did play on both channels, from
> the cd, from pcm, they were mono -- I didn't test with stereo for the
> pcm.  Is this sound card a multi channel and if so, how do I use more
> than one channel?

i meant, to test wavefiles with mono samples and stereo samples,
and check if any difference occurs.

to be sure: the pcm with stereo samples comes out only from the left
speaker, right?


Takashi


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Re: rc2 stereo problem with via8233

[Takashi Iwai]

[-- Attachment #1: Type: text/plain, Size: 181 bytes --]

At Thu, 27 Jun 2002 12:41:43 -0400,
John covici wrote:
> 
> OK, a stereo PCM does play both channels, a mono pcm plays left
> channel only.

then try the following patch.


Takashi

[-- Attachment #2: via8233-fix.dif --]
[-- Type: application/octet-stream, Size: 749 bytes --]

Index: alsa-kernel/pci/via8233.c
===================================================================
RCS file: /suse/tiwai/cvs/alsa/alsa-kernel/pci/via8233.c,v
retrieving revision 1.17
diff -u -r1.17 via8233.c
--- alsa-kernel/pci/via8233.c	26 Jun 2002 15:13:05 -0000	1.17
+++ alsa-kernel/pci/via8233.c	27 Jun 2002 17:39:42 -0000
@@ -364,7 +364,7 @@
 		outb(fmt, chip->port + VIA_REG_MULTPLAY_FORMAT);
 		/* set sample number to slot 3, 4, 7, 8, 6, 9 */
 		switch (runtime->channels) {
-		case 1: slots = (1<<0); break;
+		case 1: slots = (1<<0) | (1<<4); break;
 		case 2: slots = (1<<0) | (2<<4); break;
 		case 4: slots = (1<<0) | (2<<4) | (3<<8) | (4<<12); break;
 		case 6: slots = (1<<0) | (2<<4) | (5<<8) | (6<<12) | (3<<16) | (4<<20); break;

Re: rc2 stereo problem with via8233

[John Covici]

Thanks, your patch worked fine!  But I would still like to know if I
have a multi-channel chip and if so how to use it?  I find that
playing cd quality wav files have a very peculiar sound over this
chip -- some artifact would be my guess.  Any ideas?

on Thu, 27 Jun 2002 19:41:28 +0200 Takashi Iwai <tiwai@suse.de> wrote:

> At Thu, 27 Jun 2002 12:41:43 -0400,
> John covici wrote:
>> 
>> OK, a stereo PCM does play both channels, a mono pcm plays left
>> channel only.
>
> then try the following patch.
>
>
> Takashi
>

-- 
         John Covici
         covici@ccs.covici.com


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Re: rc2 stereo problem with via8233

[Takashi Iwai]

At Fri, 28 Jun 2002 20:32:44 -0400,
John Covici wrote:
> 
> Thanks, your patch worked fine!

ok, thanks for your tests.  now fixed on cvs.

> But I would still like to know if I have a multi-channel chip and if
> so how to use it? 

please note that here multi-channels doesn't mean the multiple
playbacks at the same time, but a pcm stream accepts channels more
than 2.
for example, you can play a wav file with 4 or 6 channels via aplay,
or playing ac3 via ac3dec with -4 or -6 option.
anyhow, it's nonsense unless you have rear and center/lfe jacks...

> I find that playing cd quality wav files have a very peculiar sound
> over this chip -- some artifact would be my guess.  Any ideas?

this problem should be on ac97 chip.
possibly there are some filters active on it.
is 3d sound switch enabled?  well, then it should affect also pcm..
hmm... or maybe a hardware problem?
do you have another soundcard to test?


Takashi


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problem with via8233

[Nick French]

Hi all

I seem to have a problem with the via8233 driver. I seem to get
breaks/crackle/pop every now and then only very small but annoying. I did
not
seem to get this with .5. Have tried to look at the code but nothing has
come to light I notice that the .9 version uses a different channel now due
to the 8233A support (I have one of these chips as well in another
Motherboard). Is there anything I can try to see if I can compile with the
old channel support to see if it is this. Can I change
VIA_REG_MULTIPLAY_STATUS to VIA_REG_PLAYBACK_STATUS and recompile. Any
ideas? It seems to be worse with apps that play multiple wav files over and
over again.

Cheers

Nick





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