Re: DOOM sound bug workaround

Hannu Savolainen (
Tue, 7 Jan 1997 08:22:11 +0200 (EET)

On Fri, 3 Jan 1997, Steve VanDevender wrote:

> For quite a while, I've had a problem with DOOM where the sound stops
> and the sound driver to emit messages like this after some random amount
> of play:
> linux: Sound: DMA (output) timed out - IRQ/DRQ config error?
> This has been happening at least since 1.2.13. Everyone's tried to
> convince me it's some kind of hardware problem, but I know that DMA
> works with my SCSI card completely reliably.
DMA by a SCSI card is a completely different thing than DMA with a
soundcard. A soundcard requires every byte right in time or otherwise an
underrun occurs. DMA with a SCSI card doesn't have this kind of requirements.

It's very possible that some SCSI activity during sound playback causes your
problem. This is the case at least if you use a PAS16 soundcard together
with an AHA1542 SCSI controller.

Best regards,

Hannu Savolainen (, (my home page) (Open Sound System (OSS)) (OSS Free/TASD/VoxWare)