Derek Tattersall wrote:
Mikkel L. Ellertson wrote:
Derek Tattersall wrote:
think I have the multiple sound cards more or less sorted out.
To sum up what I did, In order to get the 2 sound cards working for
different users, I had to modify 4 different configuration files on my
machine. They were:
/etc/security/console.perms.d/50-default.perms
/etc/udev/rules.d/90-alsa.rules
/etc/modprobe.d/modprobe.conf.dist,
$HOME/.asoundrc
I found that adding this to
/etc/security/console.perms.d/50-default.perms works:
<video>=/dev/video*
<audio>=/dev/snd/* /dev/mixer* /dev/dsp*
<console> 0660 <video> 0660 root.pulse
<console> 0660 <audio> 0660 root.pulse
Then add any users who might want to use those devices to the pulse
group
Unfortunately this only applies to devices that are plugged in on boot
up. Are devices that are plugged in after boot up handled by udev?
It tuns out that if I write my udev rules correctly (no typos) it does
work the way I want it to.
udev rules:
# Webcam
SYSFS{idVendor}=="046d", SYSFS{idProduct}=="0990", MODE="660", GROUP="pulse"
# Usb audio card
SYSFS{idVendor}=="0c45", SYSFS{idProduct}=="1677", MODE="660", GROUP="pulse"
modules.conf entries:
# On board audio card
alias snd-card-0 snd-hda-intel
# HDTV tuner card
alias snd-card-1 cx88_alsa
# USB Audio card
alias snd-card-2 snd-usb-audio
# Webcam microphone
alias snd-card-3 snd-usb-audio
options snd-hda-intel index=0
options cx88_alsa index=1
options snd-usb-audio index=2,3 vid=0x0c45,0x46d pid=0x1677,0x990
###########
My local .asoundrc file. This sets up the default card for the console
user. The mythtv user will set the Intel card to be default.
pcm.Intel { type hw; card Intel; }
ctl.Intel { type hw; card Intel; }
pcm.CX8801 { type hw; card CX8801; }
ctl.CX8801 { type hw; card CX8801; }
pcm.Audio { type hw; card Audio; }
ctl.Audio { type hw; card Audio; }
pcm.U0x46d0x990 { type hw; card U0x46d0x990; }
ctl.U0x46d0x990 { type hw; card U0x46d0x990; }
pcm.!default pcm.Audio
ctl.!default ctl.Audio
So after I modified /etc/security/console.perms.d/50-default.perms ,
/etc/udev/rules.d/90-alsa.rules, /etc/modprobe.d/modprobe.conf.dist, and
my local .asoundrc it all just works.
Have you tried it? I have not looked lately, but I know that udev
used to call console.perms when a device was hotplugged, so it could
set permissions if necessary.
Mikkel
Yes I did try it. When the device was plugged into the USB port on
boot up, the permissions were set as I wanted them to be.
When the device (A USB audio card) was plugged in after boot up, the
permissions were not set properly.
I may have to mess with the udev rules further. Maybe if I write some
kind of post-install script that manually sets the permissions.
Derek Tattersall
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