[AG-TECH] Does OSS Free support full duplex?

Leslie Arvin arvin at stat.purdue.edu
Tue Jun 18 13:27:58 CDT 2002

richardc at cs.utah.edu wrote:
> Hi all,
> I've just loaded a machine with RedHat 7.2, and I'm getting feedback
> problems. This is indicative of a problem with the hardware loopback
> enabled on the PCI128 cards.
> I haven't loaded the commercial OpenSound drivers yet, because I was
> hoping the free OSS drivers were more robust with this release of RedHat.
> Is there a magic flag or setting I haven't touched? Or, do I need to
> purchase the opensound drivers?
> -Richard

We encountered the problem with the SoundBlaster PCI 512 sound cards
with the RedHat 6.2 AGiB setup where the line-out from the card was
being looped-back to line-in.

Both the oss driver and emu10k1 driver exhibited this problem.
The following commands will turn off this loopback with the emu10k1

  /usr/local/bin/emu-dspmgr -r"Analog L:Rear L"
  /usr/local/bin/emu-dspmgr -r"Analog R:Rear R"

If anyone knows how to turn this off with the oss driver, I'd
appreciate the solution.  We're currently doing fine with the
emu10k1 driver, but it's nice to have options.

Is this case similar to your problem?

-- Leslie Arvin
   arvin at stat.purdue.edu
   Purdue University

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