1 Use Case Configuration files
2 ----------------------------
10 Those directories are not inspected for the list of available UCM
11 configurations. They contain files included from other UCMs.
13 UCM master configuration path lookup is defined in the top level
14 ucm.conf file. This file allows custom directory layout. The new
15 ucm2 layout is based on the ALSA driver name with the kernel driver
16 name as fallback. The virtual cards (no direct hw bound) lookups are
17 placed to the separate conf.virt.d directory.
19 The lookup configuration:
21 https://git.alsa-project.org/?p=alsa-ucm-conf.git;a=blob;f=ucm2/ucm.conf
23 Example paths - new conf.d scheme:
25 - conf.d/USB-Audio/Dell-WD15-Dock.conf
26 -- special configuration for the Dell docking station with USB soundcard
27 - conf.virt.d/TwoCardsMix.conf
28 -- virtual UCM from two soundcards
30 Example paths - no conf.d scheme (may be invalidated):
32 - USB-Audio/Dell-WD15-Dock.conf
33 -- special configuration for the Dell docking station with USB soundcard
34 - TwoCardsMix/TwoCardsMix.conf
35 -- virtual UCM from two soundcards
37 Note: For the driver configurations, use always the ALSA driver name or
38 the real kernel driver name - not the ucm card name configuration paths!
40 The kernel driver name is obtained using sysfs like (last
41 part of the path is used from the symlink):
44 /sys/class/sound/card0/device/driver
47 The ALSA driver name can be obtained using procfs like:
50 cat /proc/asound/cards
51 1 [NVidia ]: HDA-Intel - HDA NVidia
52 HDA NVidia at 0xb5080000 irq 17
54 driver name: HDA-Intel
55 card short name: HDA NVidia
56 card long name: HDA NVidia at 0xb5080000 irq 17
62 https://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=include/use-case.h