Lee Revell wrote:

On Thu, 2005-02-10 at 16:20 -0500, Rick Wright wrote:
  

The real problem is that the PCM output volume control sliders are 
backwards (or perhaps the remapping the channels to L/R, rather than R/L 
will fix this).  For example: PCM Front L slider controls the volume of 
playback_9 which is the RIGHT Front signal, PCM Front R slider controls 
playback_10 which is the LEFT Front signal.  This is true for all of the 
Stereo Output channel pairs.  If you think about it, the PCM sliders are 
actually controlling the correct physical L & R outputs on the card, but 
the alsa_pcm:playback signals being routed to those physical channels 
are reversed, make sense?

Is this a bug?  If so, what is the proper place/way to report it so that 
I don't use any more of your time?  Has it already been fixed?  I know 
you mentioned v008 still had problems...

    
        

ISTR that this is a hardware bug, and the kX driver works around it.  I
will look into it.

Are the channels reversed if you use JACK with the default stereo PCM,
hw:0,0?

  
      

Using hw:0,0 for BOTH the Input & Output devices in QJackCtl:
(actually, input probably doesn't matter, huh?)
playback_1 maps to Stereo Output #1 RIGHT and volume is controlled by
the PCM LEFT slider
playback_2 maps to Stereo Output #1 LEFT and volume is controlled by
the PCM RIGHT slider

In this case, it seems that slider is controlling the correct
playback_x stream, but the stream is mapped to the wrong stereo
channel of the soundcard.
    

This does look like an upstream bug.  Can you verify that the channels
are still reversed without my patch?

Lee


  

Using a stock (unpatched) alsa-driver-1.0.8 (verified that hw:0,3 is not available), here are the 2ch stereo output (using output device hw:0,0 in qjackctl) results:

playback_1 maps to Stereo Output #1 RIGHT and volume is controlled by Front (NOT PCM Front) LEFT slider
playback_2 maps to Stereo Output #2 LEFT and volume is controlled by Front (NOT PCM Front) RIGHT slider

PCM Front sliders have no effect.  However, a slider named PCM (there are two of these, I'm talking about the one on the right, next to PCM Center....I believe the one on the left controls feedthrough?) behaves exactly like the Front sliders described above, but seems to supercede the Front sliders.

Again in this unpatched case, the sliders seem to control the correct playback_x channel (assuming L-comes-first), but the playback_x channels are being routed to the sound card's physical output channels incorrectly (L/R backwards).

-Rick