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Date:      Sat, 03 Oct 2020 01:10:58 +0000
From:      bugzilla-noreply@freebsd.org
To:        x11@FreeBSD.org
Subject:   [Bug 250009] graphics/drm-fbsd12.0-kmod: sound unusable on DisplayPort after DPMS or screen OFF/ON.
Message-ID:  <bug-250009-7141-j5CEJLbpNu@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-250009-7141@https.bugs.freebsd.org/bugzilla/>
References:  <bug-250009-7141@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D250009

--- Comment #4 from Jean-Claude MICHOT <jc@michot.fr> ---
With lsof i found why 'devctl disable hdacc2' return 'device busy'.
/dev/mixer5 was always open by few process (pulse audio, kmix, kde...)

After killing the process, 'devctl disable hdacc2' was usable.

But i also need a sysctl -w dev.hdaa.2.reconfig=3D1
and re-setup the config.

The following script is ok for me:

#!/bin/sh
devctl disable hdacc2
devctl enable hdacc2
sysctl -w dev.hdaa.2.reconfig=3D1
sysctl -w hw.snd.default_unit=3D5
mixer vol 80
mixer pcm 80
# test with noise on speaker
dd if=3D/dev/random of=3D/dev/dsp bs=3D1k count=3D1

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