On Thu, 2014-03-06 at 12:42 -0500, Olivier Langlois wrote:

Hi,

I have added a second sound device in my system and it unexpectedly took the first card slot.

I have found that it is easy to control the order as long as the devices use different drivers by modifying

/etc/modprobe.d/alsa.conf

( http://alsa.opensrc.org/MultipleCards )

but in my situation I have 2 different devices using the same driver. I think that there is hope that I find an answer by digging the more general topic of ordering PCI devices drivers loading but if someone has few pointers to share, any help is welcome!

Here are my 2 devices that I would like to change the order:

lano1106@whippet2 /proc/asound $ cat cards 0 [PCH ]: HDA-Intel - HDA Intel PCH HDA Intel PCH at 0xfbf20000 irq 84 1 [HDMI ]: HDA-Intel - HDA ATI HDMI HDA ATI HDMI at 0xfbe60000 irq 88

I love Linux for allowing almost anything imaginable!

in the kernel command line, I added the following:

1.

pci-stub.ids=1002:aaa0,8086:1d20

2.

Create a systemd service

/usr/lib/systemd/system/snd_hda_intel-bind.service:

[Unit] Description=Binds PCI Audio devices to snd_hda_intel in the specified order After=syslog.target

[Service] EnvironmentFile=-/etc/snd_hda_intel.cfg Type=oneshot RemainAfterExit=yes ExecStart=-/usr/bin/snd_hda_intel-bind $DEVICES

[Install] WantedBy=multi-user.target

3.

/etc/snd_hda_intel.cfg:

DEVICES="0000:01:00.1 0000:00:1b.0"

4.

/usr/bin/snd_hda_intel-bind:

#!/bin/bash

modprobe snd_hda_intel

for var in "$@"; do if [ -e /sys/bus/pci/devices/$var/driver ]; then echo $var > /sys/bus/pci/devices/$var/driver/unbind fi echo $var > /sys/bus/pci/drivers/snd_hda_intel/bind done

Result:

lano1106@whippet2 /proc/asound :( $ cat cards 0 [HDMI ]: HDA-Intel - HDA ATI HDMI HDA ATI HDMI at 0xfbe60000 irq 87 1 [PCH ]: HDA-Intel - HDA Intel PCH HDA Intel PCH at 0xfbf20000 irq 88

tadam!