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Date: Wed, 29 Jan 1997 20:02:53 -0800 (PST)
From: Doug White <dwhite@gdi.uoregon.edu>
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Reply-To: Doug White <dwhite@resnet.uoregon.edu>
To: Mark Taylor <mtaylor@cybernet.com>
cc: multimedia@freebsd.org
Subject: Re: SoundBlaster Pro 2 card stops for video output
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On Wed, 29 Jan 1997, Mark Taylor wrote:

> >> The sound is fine unless I have another window scrolling text (as in
> >> "while [ 1 ]; do ps -ax; done").  At that time, the sound seems to
> >> stop playing (the sound process starves?).
> >
> >I can't reproduce this on my P100, GUS PnP, and ATI Mach64 video using
> >your command (under X -- the ps -ax is barely doing anything!)
> >
> >What's your video card?  
> 
> A Diamond Stealth 64 w/ 2 Mb DRAM, running Accelerated-X 2.1.

Well, I'm on XFree86, so it may be accelX related...

> >DMA 1 may be used by something else; also, the shared DMA may be confusing
> >it.  (Wait -- a Pro isn't a 16 bit device, it only has one DMA channel!)
> 
> That's right- it's supposed to be an 8 bit card, but it has a the
> extension for the 16 bit ISA bus.  Hmmm...
> 
> >
> >> I have DMA channel 1 and IRQ channels 5 and 7 set for "Legacy ISA" in the BIOS
> >> config (yes, there are four PCI devices in there: de0, video, PCI IDE,
> >> and USB port), so nothing should be stealing the IRQ or DMA channel.
> >
> >How about other ISA devices?
> 
> There are no other ISA cards in the machine!

Everything else checks out, or so it appears.  

The only thing I can think of is that accelX  is stickier about video
output that XFree is.

Doug White                              | University of Oregon  
Internet:  dwhite@resnet.uoregon.edu    | Residence Networking Assistant
http://gladstone.uoregon.edu/~dwhite    | Computer Science Major