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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