Re: [Openvortex-dev] Stereo swapping.

[Ryan Underwood]

I just noticed my syslog is getting spamed with the following:

ALSA ../alsa-kernel/core/pcm_lib.c:156: Unexpected hw_pointer value
(stream = 0, delta: -75, max jitter = 8192): wrong interrupt
acknowledge?
vortex: stop 1
ALSA ../alsa-kernel/core/pcm_lib.c:156: Unexpected hw_pointer value
(stream = 0, delta: -475, max jitter = 2048): wrong interrupt
acknowledge?
vortex: de alloc 1
ALSA ../alsa-kernel/core/pcm_lib.c:215: Unexpected hw_pointer value
(stream = 0, delta: -502, max jitter = 2048): wrong interrupt
acknowledge?
ALSA ../alsa-kernel/core/pcm_lib.c:215: Unexpected hw_pointer value
(stream = 0, delta: -499, max jitter = 2048): wrong interrupt
acknowledge?
ALSA ../alsa-kernel/core/pcm_lib.c:215: Unexpected hw_pointer value
(stream = 0, delta: -496, max jitter = 2048): wrong interrupt
acknowledge?
ALSA ../alsa-kernel/core/pcm_lib.c:215: Unexpected hw_pointer value
(stream = 0, delta: -495, max jitter = 2048): wrong interrupt
acknowledge?

what about the others with swapping?

On Sat, Jun 28, 2003 at 08:29:45PM -0400, Manuel Jander wrote:
> Hello,
> 
> Thanks to everyone who sent the requested info. Unfortunately i have to
> admit that i found no common element between the people having Clicks,
> stereo swapping or high speed playback :(
> 
> Regarding clicks and stereo swapping, i think these have the same root. 
> I think that stereo swapping can be caused by some DMA transfer being
> missed. Since the data is 16 bit, and they are multiplexed
> (interleaved), there must be a loss of a 16bit word to cause loosing
> synchronisity.
> On the Aureal Vortex card, the DMA engine takes one sample and puts it
> into the left pipeline, takes another and puts it into the right
> pipeline, and then again the left, right, etc. If one sample gets lost,
> the card would put the samples into the wrong pipeline.
> Maybe some PCI features as Write Merge/Combining are involved ?
> 
> The infamous Chip'n Dale bug... I thought it was gone. Those people
> still having fast play problems: "Are you really sure you are using the
> latest CVS ALSA driver ????". 
> 
> Best Regards
> 
> Manuel Jander.
> 
> On Sat, 2003-06-28 at 03:28, J. Gordon Wolfe wrote:
> > On Fri, 2003-06-27 at 18:08, Manuel Jander wrote:
> > > I got an idea:
> > > 
> > > What versions of GCC are you using ? I used GCC-3.2 since i started
> > > working on the ALSA driver. Now i'm using GCC 3.3. What versions are you
> > > using ? Please other people report that too please.
> > > 
> > > Best Regards
> > > 
> > > Manuel Jander
> > 
> > GCC 3.2.2 for me
> > 
> >  - Gordon
> 
> 
> 
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-- 
Ryan Underwood, <nemesis at icequake.net>, icq=10317253