Vladimir Dergachev
On Wed, 3 Mar 1999 T.Mertes@mobilkom.at wrote:
> First problem:
>
> I have a sb 16 vibra sound card.
> I let the BIOS configure the IRQ and dma channels as
> suggested in the docs.
> BIOS states in the booting messages that
> the IRQ is 5 and the DMA channels are 1 and 0.
>
> Only when I use 0 as second DMA channel, /dev/dsp
> is working.
>
> In the booting process I get the following message:
>
> SB16: Bad or missing 16 bit DMA channel
>
> I found this message in sb_common.c in an if statement:
>
> if (hv_config->dma2 < 5 || hw_config->dma2 > 7)
>
> In the same if statement devc->dma16 is set to devc->dma8
>
> Does this mean that: The BIOS assigned 0 (Zero) as
> 16 bit DMA channel and the card is only able to use 5, 6 and 7?
>
> If I do not use IRQ 5 and DMA channels 1 and 0 the /dev/dsp
> device is not useable.
>
>
> Second problem:
> When playing a wav file with
>
> sox file.wav -t ossdsp -w -s /dev/dsp
>
> I get sometimes dropouts when there is some load on the
> SCSI disk and/or SCSI CDROM.
> Without load I get almost no dropouts.
>
> There is one ISA disk mounted. But this disk is almost
> empty and the load is on SCSI.
>
> So the old answer: With load on ISA you have dropouts in
> sound does not really count.
>
> As next step I will unmount the ISA disks and provide
> with ISA support as module or without ISA support at
> all. But I do not think that this makes a change in the
> behaviour since (chorus): The SCSI load creates the dropouts.
>
>
> Third a question:
> Is there a sound card which avoids both problems (IRQ/DMA config) and
> dropouts (by having a bigger buffer, sending an interupt earlier, having
> a better driver ... )?
>
>
> Some Information about my computer:
> Kernel: 2.2.2 compiled without modules (no patches) (SMP)
> Distribution: Suse 6.0
> Motherborard: Gigabyte 686BXDS
> Processors: Two Pentium II 350 Mhz
> Scsi - Adapter: Adaptec 7895 (build into the motherboard)
> HD: IBM UW 9100MB
> CD-Rom: Plextor 40X UltraSCSI
> Sound card: sb 16 vibra
>
>
> Thanks in advance
> Thomas
>
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