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[Ichthyostega <648992@xxxxxxxxxxxxxxxxxx>]

Incidentally, the Documentation of the ALSA-DSP MADI Driver (this is another interface, but
from the same manufacturer RME) has a nice explanation of the "Precise Pointer" parameter:
https://www.kernel.org/doc/Documentation/sound/alsa/hdspm.txt

> Hardware-pointer -- 2 Modi

>   The Card supports the readout of the actual Buffer-pointer,
>   where DMA reads/writes. Since of the bulk mode of PCI it is only
>   64 Byte accurate. SO it is not really usable for the
>   ALSA-mid-level functions (here the buffer-ID gives a better
>   result), but if MMAP is used by the application. Therefore it
>   can be configured at load-time with the parameter
>   precise-pointer.
...
>   Precise Pointer -- off 		interrupt used for pointer-calculation
>   Precise Pointer -- on 		hardware pointer used.

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https://bugs.launchpad.net/bugs/648992

Title:
  Hammerfall DSP needs alsactl init db entry to work with Pulseaudio

Status in alsa-utils package in Ubuntu:
  Triaged

Bug description:
  Advice for getting Pulseaudio to work with the DSP Hammerfall one can
  find on the net is rather scarce.  The default behavior mostly refuses
  to operate at all.

  The advice found on the net more or less recommends starting with
  something like

  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

  in the /etc/pulse/default.pa configuration.

  It turns out that tsched=0 operation is not actually necessary: it
  suffices to do

  amixer -D hw:DSP cset 'iface=CARD,name=Precise Pointer' On

  before starting Pulseaudio.  It seems likely that this kind of setup
  should be put somewhere in the alsa initialization.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: alsa-base 1.0.22.1+dfsg-0ubuntu3
  ProcVersionSignature: Ubuntu 2.6.31-11.154-rt
  Uname: Linux 2.6.31-11-rt i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.20.
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  dak       12880 F.... hdspmixer
   /dev/snd/controlC0:  dak       14300 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'I82801DBICH4'/'Intel 82801DB-ICH4 with AD1981B at irq 5'
     Mixer name	: 'Analog Devices AD1981B'
     Components	: 'AC97a:41445374'
     Controls      : 26
     Simple ctrls  : 18
  Card1.Amixer.info:
   Card hw:1 'DSP'/'RME Hammerfall DSP + Multiface at 0xc8000000, irq 5'
     Mixer name	: 'Xilinx FPGA'
     Components	: ''
     Controls      : 25
     Simple ctrls  : 18
  Date: Mon Sep 27 17:07:03 2010
  PackageArchitecture: all
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  dmi.bios.date: 06/18/2007
  dmi.bios.vendor: IBM
  dmi.bios.version: 1RETDRWW (3.23 )
  dmi.board.name: 2373TG5
  dmi.board.vendor: IBM
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: IBM
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnIBM:bvr1RETDRWW(3.23):bd06/18/2007:svnIBM:pn2373TG5:pvrThinkPadT41:rvnIBM:rn2373TG5:rvrNotAvailable:cvnIBM:ct10:cvrNotAvailable:
  dmi.product.name: 2373TG5
  dmi.product.version: ThinkPad T41
  dmi.sys.vendor: IBM

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