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Date:      Tue, 28 Jan 1997 23:49:39 -0800 (PST)
From:      Doug White <dwhite@gdi.uoregon.edu>
To:        Mark Taylor <mtaylor@cybernet.com>
Cc:        multimedia@freebsd.org
Subject:   Re: SoundBlaster Pro 2 card stops for video output
Message-ID:  <Pine.BSI.3.94.970128234800.24983z-100000@localhost>
In-Reply-To: <XFMail.970128182337.mtaylor@cybernet.com>

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On Tue, 28 Jan 1997, Mark Taylor wrote:

> I have a Pentium 166 MHz system w/ FreeBSD-2.2-ALPHA and a SoundBlaster Pro 2
> (CT 1600) sound card.
> 
> 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?  

> I've tried the sound card at IRQ 5 and 7 (always DMA channel 1), with
> and w/o the 'shared DMA channel' set on the card.  Nothing else is
> using the IRQ or DMA channel that the sound card is on.  I've been
> setting the LPT device to the other IRQ [5 or 7].  I've also tried
> setting "options SBC_IRQ=5" in the kernel config file (and rebuilding/
> installing it).

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!)

> 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?

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




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