[alsa-devel] Altec Lansing FX5051 mixer

[Jeremy Nickurak]

Sorry, mis-post.

On Tue, Aug 28, 2007 at 08:50:00AM +0200, Clemens Ladisch wrote:
> >         bmaControls( 0)      0x15
> >           Mute
> >           Bass
> >           Treble
> >         bmaControls( 1)      0x02
> >           Volume
> >         bmaControls( 2)      0x02
> >           Volume
> >         bmaControls( 3)      0x00
> >         bmaControls( 4)      0x00
> >         bmaControls( 5)      0x00
> >         bmaControls( 6)      0x00
>
> These descriptors say that there is a two-channel volume control that
> applies to the front channels, but I guess it really affects all
> channels.
>
> Please show the output of "amixer contents" for this card.

numid=3,iface=MIXER,name='Tone Control - Bass'
  ; type=INTEGER,access=rw------,values=1,min=0,max=10,step=0
  : values=5
numid=4,iface=MIXER,name='Tone Control - Treble'
  ; type=INTEGER,access=rw------,values=1,min=0,max=10,step=0
  : values=5
numid=1,iface=MIXER,name='PCM Playback Switch'
  ; type=BOOLEAN,access=rw------,values=1
  : values=on
numid=2,iface=MIXER,name='PCM Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=49,step=0
  : values=48,48
  | dBscale-min=-49.00dB,step=1.00dB,mute=0


>
> > ...
> >         HID Device Descriptor:
> >           bLength                 9
> >           bDescriptorType        33
> >           bcdHID               1.00
> >           bCountryCode            0 Not supported
> >           bNumDescriptors         1
> >           bDescriptorType        34 Report
> >           wDescriptorLength     172
> >           Report Descriptor: (length is 172)
> >             Item(Global): Usage Page, data= [ 0x0c ] 12
> >                             Consumer
> >             Item(Local ): Usage, data= [ 0x01 ] 1
> >                             Consumer Control
> >             Item(Main  ): Collection, data= [ 0x01 ] 1
> >                             Application
> >             Item(Global): Usage Page, data= [ 0x0c ] 12
> >                             Consumer
> >             Item(Local ): Usage, data= [ 0xe2 ] 226
> >                             Mute
> >             Item(Local ): Usage, data= [ 0xe9 ] 233
> >                             Volume Increment
> > ...
>
> This describes an input device that reports 'key' presses to the
> computer.  I guess the control panel and remote control don't have a
> direct effect but expect the computer to explicitly change mixer
> controls when a key is pressed.

Since it works fine in Windows without any non-ms software, would this
imply that this is somewhat standard behavior?

>
> However, this shouldn't prevent alsamixer from working.
>
> It might be possible that the mixer controls don't have many steps and
> that the step size used by alsamixer is so small that the device rounds
> the setting back to the old position.  Please try PageUp/Down or Home/
> End instead of Up/Down keys.

PgUp/PgDown don't do any better on any controls. I seem to be able to
drop the PCM volume to nothing in practice with End, but Home won't
restore it. Up/Down immediately brings it back up to 100%. The LED's on
the control reflect this btw, but alsamixer still reports 98%.

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