Date: Fri, 8 Feb 2008 10:02:02 GMT From: Aragon Gouveia <aragon@phat.za.net> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/120406: Handling newly attached pcm devices (eg. via uaudio) Message-ID: <200802081002.m18A22ip016467@www.freebsd.org> Resent-Message-ID: <200802081010.m18AA0Hh069355@freefall.freebsd.org>
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>Number: 120406
>Category: misc
>Synopsis: Handling newly attached pcm devices (eg. via uaudio)
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Fri Feb 08 10:10:00 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator: Aragon Gouveia
>Release: 7.0-RC1
>Organization:
>Environment:
FreeBSD geek.pcs.intranet 7.0-RC1 FreeBSD 7.0-RC1 #0: Wed Jan 16 17:07:28 SAST 2008 root@geek.pcs.intranet:/usr/obj/usr/src/sys/GEEK i386
>Description:
On my FreeBSD workstations I frequently use a USB sound device (headphone amplifier). I typically plug it in and out only when I need it, and expect (or hope!) for my system to use it when it's plugged in, but use the onboard sound when it is unplugged.
On FreeBSD 7 I used to set hw.snd.default_unit to 1 (from 0) after plugging the device in and then set the mixer levels to how I want them. I've subsequently automated this ala devd and a shell script to do precisely the same thing, except the shell script also calls /etc/rc.d/mixer to restore the saved mixer settings in /var/db. I would like to PR my work in the hope of someone committing it as I think it might be useful to others.
I've included a devd.conf addition and an rc script for inclusion to /etc/rc.d. The rc script only works if pcm_defaulthot is set to YES in /etc/rc.conf, and I would say it should be set to NO by default.
>How-To-Repeat:
>Fix:
devd.conf entry:
attach 100 {
device-name "pcm[0-9]+";
action "/etc/rc.d/pcm start $device-name";
};
Patch attached with submission follows:
#!/bin/sh
#
# PROVIDE: pcm
# REQUIRE: DAEMON cleanvar
# KEYWORD: nojail
. /etc/rc.subr
name=pcm
rcvar="pcm_defaulthot"
start_cmd="pcm_start"
load_rc_config $name
pcm_start()
{
local pcm_unit
pcm_unit=${pcm_device#pcm}
if [ "${pcm_unit}" -ge 0 ]; then
sysctl -w hw.snd.default_unit=${pcm_unit}
/etc/rc.d/mixer start mixer${pcm_unit}
fi
}
if [ -n "$2" ]; then
pcm_device=$2
run_rc_command $*
fi
>Release-Note:
>Audit-Trail:
>Unformatted:
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