[pulseaudio-discuss] [PATCH] alsa-mixer: Disable headphones when playing to speakers

[Arun Raghavan]

Assume that the headphone port volume is lower than the speaker volume.
When plugging in headphones, if the path is active, while the jack is
being inserted and before it is actually detected as being plugged in,
it will still receive the signal being played (which is at a higher
volume than it will be when plugged in completely). The volume
difference manifests as a volume spike when the headphones are plugged
in, before the final volume is set.

This patch is required to prevent such a volume spike when plugging in
headphones. The problem is not fixed completely, but the spike is
shortened. To be fixed completely, we need to apply the port volume
before unmuting the new path.
---
 src/modules/alsa/mixer/paths/analog-output-speaker.conf | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/src/modules/alsa/mixer/paths/analog-output-speaker.conf b/src/modules/alsa/mixer/paths/analog-output-speaker.conf
index 8416a25..ccd438f 100644
--- a/src/modules/alsa/mixer/paths/analog-output-speaker.conf
+++ b/src/modules/alsa/mixer/paths/analog-output-speaker.conf
@@ -54,16 +54,15 @@ override-map.2 = all-left,all-right
 switch = off
 volume = off
 
-; This profile path is intended to control the speaker, not the
-; headphones. But it should not hurt if we leave the headphone jack
-; enabled nonetheless.
+; This profile path is intended to control the speaker, let's mute headphones
+; else there will be a spike when plugging in headphones
 [Element Headphone]
-switch = mute
-volume = zero
+switch = off
+volume = off
 
 [Element Headphone2]
-switch = mute
-volume = zero
+switch = off
+volume = off
 
 [Element Speaker]
 required-any = any
-- 
1.8.2.1