[Pkg-alsa-devel] Bug#316837: marked as done (alsa-modules-2.4.27-2-686: oss emulation can't co-exist with native oss)
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From: freevo <freevo@chimpanzee.homeip.net>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: alsa-modules-2.4.27-2-686: oss emulation can't co-exist with native oss
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Package: alsa-modules-2.4.27-2-686
Severity: normal
This actually should be an upstream bug. The current oss emulation code(sound_oss.c)
use register_sound_special to register the minor device. register_sound_special
would search for the first available slot. But the coding in alsa basically use a
hardcoded scheme to convert between also card number and minor number in oss.
This means that if there is any native oss driver loaded, the number will get all
mess up(card 0 should be minor 3 for PCM but if another oss driver is loaded,
minor 3 would be occupied and the return would be 19 instead). While the current
code handles this case to abort, it makes mixing both oss and alsa not possible.
While not just take whatever returned as the valid one then stored it and
unregistered accordingly ?
I need oss native driver because there is no alsa driver for my device but I need
alsa driver at the same time because there is another device that isn't supported
by oss driver.
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>From jdthood@aglu.demon.nl Tue Jul 05 01:13:25 2005
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Message-ID: <42CA40FE.1060207@aglu.demon.nl>
Date: Tue, 05 Jul 2005 10:12:46 +0200
From: Thomas Hood <jdthood@aglu.demon.nl>
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To: 316837-done@bugs.debian.org
Subject: Re: [Pkg-alsa-devel] Bug#316837: alsa-modules-2.4.27-2-686: oss emulation
can't co-exist with native oss
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freevo wrote:
>This actually should be an upstream bug.
>
Thanks for the report.
In the future you can file reports of upstream bugs at
https://bugtrack.alsa-project.org/alsa-bug .
> The current oss emulation code(sound_oss.c)
>use register_sound_special to register the minor device. register_sound_special
>would search for the first available slot. But the coding in alsa basically use a
>hardcoded scheme to convert between also card number and minor number in oss.
>
>This means that if there is any native oss driver loaded, the number will get all
>mess up(card 0 should be minor 3 for PCM but if another oss driver is loaded,
>minor 3 would be occupied and the return would be 19 instead). While the current
>code handles this case to abort, it makes mixing both oss and alsa not possible.
>
>
Mixing OSS with ALSA is not supported.
>While not just take whatever returned as the valid one then stored it and
>unregistered accordingly ?
>
>I need oss native driver because there is no alsa driver for my device but I need
>alsa driver at the same time because there is another device that isn't supported
>by oss driver.
>
What you want to do is unfortunately not supported currently. I suggest
that you
submit a wish upstream.
--
Thomas Hood