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Preview: 78-sound-card.rules Size: 4.70 KB
//lib/udev/rules.d/78-sound-card.rules
# do not edit this file, it will be overwritten on update

SUBSYSTEM!="sound", GOTO="sound_end"

ACTION=="add|change", KERNEL=="controlC*", ATTR{../uevent}="change"
ACTION!="change", GOTO="sound_end"

# Ok, we probably need a little explanation here for what the two lines above
# are good for.
#
# The story goes like this: when ALSA registers a new sound card it emits a
# series of 'add' events to userspace, for the main card device and for all the
# child device nodes that belong to it. udev relays those to applications,
# however only maintains the order between father and child, but not between
# the siblings. The control device node creation can be used as synchronization
# point. All other devices that belong to a card are created in the kernel
# before it. However unfortunately due to the fact that siblings are forwarded
# out of order by udev this fact is lost to applications.
#
# OTOH before an application can open a device it needs to make sure that all
# its device nodes are completely created and set up.
#
# As a workaround for this issue we have added the udev rule above which will
# generate a 'change' event on the main card device from the 'add' event of the
# card's control device. Due to the ordering semantics of udev this event will
# only be relayed after all child devices have finished processing properly.
# When an application needs to listen for appearing devices it can hence look
# for 'change' events only, and ignore the actual 'add' events.
#
# When the application is initialized at the same time as a device is plugged
# in it may need to figure out if the 'change' event has already been triggered
# or not for a card. To find that out we store the flag environment variable
# SOUND_INITIALIZED on the device which simply tells us if the card 'change'
# event has already been processed.

KERNEL!="card*", GOTO="sound_end"

ENV{SOUND_INITIALIZED}="1"

IMPORT{builtin}="hwdb"
SUBSYSTEMS=="usb", IMPORT{builtin}="usb_id"
SUBSYSTEMS=="usb", GOTO="skip_pci"

SUBSYSTEMS=="firewire", ATTRS{guid}=="?*", \
  ENV{ID_BUS}="firewire", ENV{ID_SERIAL}="$attr{guid}", ENV{ID_SERIAL_SHORT}="$attr{guid}", \
  ENV{ID_VENDOR_ID}="$attr{vendor}", ENV{ID_MODEL_ID}="$attr{model}", \
  ENV{ID_VENDOR}="$attr{vendor_name}", ENV{ID_MODEL}="$attr{model_name}"
SUBSYSTEMS=="firewire", GOTO="skip_pci"

SUBSYSTEMS=="pci", ENV{ID_BUS}="pci", ENV{ID_VENDOR_ID}="$attr{vendor}", ENV{ID_MODEL_ID}="$attr{device}"
SUBSYSTEMS=="pci", GOTO="skip_pci"

# If we reach here, the device nor any of its parents are USB/PCI/firewire bus devices.
# If we now find a parent that is a platform device, assume that we're working with
# an internal sound card.
SUBSYSTEMS=="platform", ENV{SOUND_FORM_FACTOR}="internal", GOTO="sound_end"

LABEL="skip_pci"

# Define ID_ID if ID_BUS and ID_SERIAL are set. This will work for both
# USB and firewire.
ENV{ID_SERIAL}=="?*", ENV{ID_USB_INTERFACE_NUM}=="?*", ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}-$env{ID_USB_INTERFACE_NUM}"
ENV{ID_SERIAL}=="?*", ENV{ID_USB_INTERFACE_NUM}=="", ENV{ID_ID}="$env{ID_BUS}-$env{ID_SERIAL}"

IMPORT{builtin}="path_id"

# The values used here for $SOUND_FORM_FACTOR and $SOUND_CLASS should be kept
# in sync with those defined for PulseAudio's src/pulse/proplist.h
# PA_PROP_DEVICE_FORM_FACTOR, PA_PROP_DEVICE_CLASS properties.

# If the first PCM device of this card has the pcm class 'modem', then the card is a modem
ATTR{pcmC%nD0p/pcm_class}=="modem", ENV{SOUND_CLASS}="modem", GOTO="sound_end"

# Identify cards on the internal PCI bus as internal
SUBSYSTEMS=="pci", DEVPATH=="*/0000:00:??.?/sound/*", ENV{SOUND_FORM_FACTOR}="internal", GOTO="sound_end"

# Devices that also support Image/Video interfaces are most likely webcams
SUBSYSTEMS=="usb", ENV{ID_USB_INTERFACES}=="*:0e????:*", ENV{SOUND_FORM_FACTOR}="webcam", GOTO="sound_end"

# Matching on the model strings is a bit ugly, I admit
ENV{ID_MODEL}=="*[Ss]peaker*", ENV{SOUND_FORM_FACTOR}="speaker", GOTO="sound_end"
ENV{ID_MODEL_FROM_DATABASE}=="*[Ss]peaker*", ENV{SOUND_FORM_FACTOR}="speaker", GOTO="sound_end"

ENV{ID_MODEL}=="*[Hh]eadphone*", ENV{SOUND_FORM_FACTOR}="headphone", GOTO="sound_end"
ENV{ID_MODEL_FROM_DATABASE}=="*[Hh]eadphone*", ENV{SOUND_FORM_FACTOR}="headphone", GOTO="sound_end"

ENV{ID_MODEL}=="*[Hh]eadset*", ENV{SOUND_FORM_FACTOR}="headset", GOTO="sound_end"
ENV{ID_MODEL_FROM_DATABASE}=="*[Hh]eadset*", ENV{SOUND_FORM_FACTOR}="headset", GOTO="sound_end"

ENV{ID_MODEL}=="*[Hh]andset*", ENV{SOUND_FORM_FACTOR}="handset", GOTO="sound_end"
ENV{ID_MODEL_FROM_DATABASE}=="*[Hh]andset*", ENV{SOUND_FORM_FACTOR}="handset", GOTO="sound_end"

ENV{ID_MODEL}=="*[Mm]icrophone*", ENV{SOUND_FORM_FACTOR}="microphone", GOTO="sound_end"
ENV{ID_MODEL_FROM_DATABASE}=="*[Mm]icrophone*", ENV{SOUND_FORM_FACTOR}="microphone", GOTO="sound_end"

LABEL="sound_end"

Directory Contents

Dirs: 0 × Files: 66
Name Size Perms Modified Actions
01-md-raid-creating.rules
321 B lrw-r--r-- 2025-11-05 10:54:46
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10-dm.rules
7.10 KB lr--r--r-- 2026-01-23 07:31:05
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11-dm-lvm.rules
2.37 KB lr--r--r-- 2026-01-23 07:31:05
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11-dm-parts.rules
1.41 KB lrw-r--r-- 2025-04-22 01:55:39
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13-dm-disk.rules
1.75 KB lr--r--r-- 2026-01-23 07:31:05
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40-elevator.rules
728 B lrw-r--r-- 2026-01-26 09:29:12
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40-redhat.rules
1.79 KB lrw-r--r-- 2026-01-26 09:29:16
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40-usb-blacklist.rules
457 B lrw-r--r-- 2022-10-08 10:09:12
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50-udev-default.rules
3.66 KB lrw-r--r-- 2026-01-26 09:29:54
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60-alias-kmsg.rules
357 B lrw-r--r-- 2026-01-26 09:29:18
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60-block.rules
626 B lrw-r--r-- 2026-01-26 09:29:11
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60-cdrom_id.rules
1.05 KB lrw-r--r-- 2018-06-22 11:11:49
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60-drm.rules
413 B lrw-r--r-- 2018-06-22 11:11:49
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60-evdev.rules
974 B lrw-r--r-- 2018-06-22 11:11:49
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60-fido-id.rules
165 B lrw-r--r-- 2026-01-26 09:29:16
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60-input-id.rules
282 B lrw-r--r-- 2018-06-22 11:11:49
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60-net.rules
129 B lrw-r--r-- 2025-09-23 08:27:35
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60-persistent-alsa.rules
616 B lrw-r--r-- 2018-06-22 11:11:49
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60-persistent-input.rules
2.65 KB lrw-r--r-- 2018-06-22 11:11:49
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60-persistent-storage-tape.rules
1.61 KB lrw-r--r-- 2026-01-26 09:29:20
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60-persistent-storage.rules
6.38 KB lrw-r--r-- 2018-06-22 11:11:49
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60-persistent-v4l.rules
769 B lrw-r--r-- 2018-06-22 11:11:49
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60-raw.rules
326 B lrw-r--r-- 2026-02-04 20:18:17
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60-sensor.rules
727 B lrw-r--r-- 2018-06-22 11:11:49
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60-serial.rules
1.16 KB lrw-r--r-- 2018-06-22 11:11:49
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60-tpm-udev.rules
211 B lrw-r--r-- 2019-10-17 03:56:47
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61-scsi-sg3_id.rules
4.67 KB lrw-r--r-- 2017-09-18 19:15:01
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63-fc-wwpn-id.rules
624 B lrw-r--r-- 2022-10-08 10:09:12
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63-md-raid-arrays.rules
2.57 KB lrw-r--r-- 2025-11-05 10:54:46
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63-scsi-sg3_symlink.rules
2.82 KB lrw-r--r-- 2015-10-29 20:52:08
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64-btrfs.rules
616 B lrw-r--r-- 2026-01-26 09:29:54
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64-md-raid-assembly.rules
2.31 KB lrw-r--r-- 2025-11-05 10:54:46
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66-azure-ephemeral.rules
1.91 KB lrw-r--r-- 2023-12-04 11:47:40
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66-kpartx.rules
1.12 KB lrw-r--r-- 2025-04-22 01:55:39
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68-del-part-nodes.rules
1.12 KB lrw-r--r-- 2025-04-22 01:55:39
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69-dm-lvm-metad.rules
5.69 KB lr--r--r-- 2026-01-23 07:31:05
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69-md-clustered-confirm-device.rules
858 B lrw-r--r-- 2025-11-05 10:54:46
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70-joystick.rules
432 B lrw-r--r-- 2018-06-22 11:11:49
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70-mouse.rules
734 B lrw-r--r-- 2018-06-22 11:11:49
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70-power-switch.rules
568 B lrw-r--r-- 2018-06-22 11:11:49
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70-touchpad.rules
473 B lrw-r--r-- 2018-06-22 11:11:49
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70-uaccess.rules
2.61 KB lrw-r--r-- 2018-06-22 11:11:49
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71-prefixdevname.rules
403 B lrw-r--r-- 2019-12-16 19:52:15
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71-seat.rules
2.69 KB lrw-r--r-- 2026-01-26 09:29:53
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73-idrac.rules
316 B lrw-r--r-- 2026-01-26 09:29:10
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73-seat-late.rules
636 B lrw-r--r-- 2026-01-26 09:30:00
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75-net-description.rules
452 B lrw-r--r-- 2018-06-22 11:11:49
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75-probe_mtd.rules
174 B lrw-r--r-- 2018-06-22 11:11:49
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78-sound-card.rules
4.70 KB lrw-r--r-- 2018-06-22 11:11:49
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80-drivers.rules
615 B lrw-r--r-- 2018-06-22 11:11:49
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80-net-setup-link.rules
292 B lrw-r--r-- 2018-06-22 11:11:49
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80-udisks2.rules
9.14 KB lrw-r--r-- 2025-09-03 09:06:58
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81-hc-network-interfaces.rules
415 B lrw-r--r-- 2021-11-16 10:21:24
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84-nm-drivers.rules
533 B lrw-r--r-- 2022-10-10 13:57:58
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85-nm-unmanaged.rules
1.97 KB lrw-r--r-- 2022-10-11 07:42:01
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90-fwupd-devices.rules
281 B lrw-r--r-- 2022-06-15 11:54:43
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90-iprutils.rules
70 B lrw-r--r-- 2020-05-08 14:19:42
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90-nm-thunderbolt.rules
588 B lrw-r--r-- 2022-10-10 13:57:58
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90-vconsole.rules
510 B lrw-r--r-- 2026-01-26 09:29:53
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91-drm-modeset.rules
56 B lrw-r--r-- 2023-10-11 21:18:04
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95-dm-notify.rules
483 B lr--r--r-- 2026-01-23 07:31:05
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98-kexec.rules
695 B lrw-r--r-- 2024-09-24 08:36:00
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99-hc-volume-automount.rules
1.23 KB lrw-r--r-- 2019-07-22 08:46:43
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99-nfs.rules
95 B lrw-r--r-- 2025-06-04 10:53:59
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99-qemu-guest-agent.rules
130 B lrw-r--r-- 2025-08-07 12:04:07
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99-systemd.rules
4.26 KB lrw-r--r-- 2026-01-26 09:29:54
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