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alsa: Allow "fallback" configuration for mappings and profiles

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A fallback mapping or profile will only be considered for probing
if all non-fallback profiles fail.

If auto-profiles are used, a profile made up of one non-fallback
mapping and one fallback mapping will be considered a fallback profile.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
This commit is contained in:
David Henningsson 2014-07-25 15:05:45 +02:00
parent be8311417c
commit c15107eaf6
3 changed files with 78 additions and 4 deletions
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2
src/modules/alsa/mixer/profile-sets/default.conf
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@ -57,6 +57,7 @@
;
; exact-channels = yes | no # If no, and the exact number of channels is not supported,
; # allow device to be opened with another channel count
; fallback = no | yes # This mapping will only be considered if all non-fallback mappings fail
; [Profile id]
; input-mappings = ... # Lists mappings for sources on this profile, those mapping must be
; # defined in this file too
@ -68,6 +69,7 @@
; # will be assumed as working without probing. Makes initialization
; # a bit faster but only works if the card is really known well.
;
; fallback = no | yes # This profile will only be considered if all non-fallback profiles fail
; [DecibelFix element] # Decibel fixes can be used to work around missing or incorrect dB
; # information from alsa. A decibel fix is a table that maps volume steps
; # to decibel values for one volume element. The "element" part in the