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Date:      Mon, 26 May 2003 02:48:02 -0700
From:      Terry Lambert <tlambert2@mindspring.com>
To:        Fritz Heinrichmeyer <fritz.heinrichmeyer@fernuni-hagen.de>
Cc:        freebsd-current@freebsd.org
Subject:   Re: CMedia CMI8738 works when setting pnp-os to no
Message-ID:  <3ED1E2D2.AC5D07AE@mindspring.com>
References:  <86vfvycc0x.fsf@jfh00.fernuni-hagen.de>

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Fritz Heinrichmeyer wrote:
> as title says, now i have to set pnp-os to "no" in my bios setup for
> sound playing to work.

Usually this indicates that there is some initialization
that's done by the BIOS that doesn't happen in the case of
"pnp-os=yes" because the hardware expects the OS's driver
to do the work.

The main thing I've seen with motherboards that behave
this way is power management: they expect the OS to turn
the power on before it tries to use the device.  Probably
the chip itself is on, and the output amp is turned off.

I mentioned this before in a similar thread; if you hack
the driver to turn the power on, it should fix this for
you.  I've seen the same thing with a USB keyboard and
mouse, on one motherboard...

-- Terry



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