[pulseaudio-discuss] Some info on the RME Hammerfall DSP

[David Kastrup]

David Kastrup <dak at gnu.org> writes:

[...]

> load-module module-alsa-sink sink_name=dsp_out device=hw:DSP format=s32le channels=18 channel_map=left,right,aux0,aux1,aux2,aux3,aux4,aux5,aux6,aux7,aux8,aux9,aux10,aux11,aux12,aux13,aux14,aux15 tsched=0
> load-module module-alsa-source source_name=dsp_in device=hw:DSP format=s32le channels=18 channel_map=left,right,aux0,aux1,aux2,aux3,aux4,aux5,aux6,aux7,aux8,aux9,aux10,aux11,aux12,aux13,aux14,aux15 tsched=0
>
> into the default configuration.  That works reasonably well, but one
> gets glitches most particularly when playing Flash audio.
>
> I just now figured out that removing the tsched=0 lines works fine as
> long as you run
>
>     amixer -D hw:DSP cset numid=23 on
>
> before starting pulseaudio.
>
>     amixer -D hw:DSP cget numid=23
>
> now displays
>
> numid=23,iface=CARD,name='Precise Pointer'
>   ; type=BOOLEAN,access=rw------,values=1
>   : values=on
>
> where the default is 'off'.  Which does not appear to disturb Jack.  But
> pulseaudio most certainly does not seem to like it, with tsched=1
> suffering much worse than tsched=0.
>
> Setting this to 'On' makes pulseaudio work worse with tsched=0, and
> apparently have no problems with tsched=1.

Might likely be added as a PostScriptum to Trac ticket #764.

> Is there any way I can get Pulseaudio to set this particular control
> when opening the hw:DSP device?

That I still want to know.

-- 
David Kastrup