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571ff40704
When selecting an HDMI/DisplayPort (IEC958) output path, the hardware
mute switch remains in kernel default state (muted), causing no audio
output despite correct software routing.
Root cause: pa_alsa_path_select() only sets mute switches when
mute_during_activation is enabled. No mixer paths enable this setting,
making the switch configuration code unreachable for IEC958 paths.
Solution: Always set mute switches to match device mute status after
path activation, regardless of mute_during_activation setting.
Testing: Added test-alsa-path-select tool to verify the fix.
- Loads mixer path and calls pa_alsa_path_select()
- Verifies switch states match expected values
- Tested on AMD Radeon HDMI and Realtek ALC257 analog
Manual verification:
- Before: IEC958 switch OFF, no audio
- After: IEC958 switch set correctly, audio works
This bug was inherited from PulseAudio's ALSA mixer path code where
HDMI path configurations lack IEC958 unmute sections.
Fixes: https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/3261
See-Also: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/issues/562
See-Also:
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|---|---|---|
| .. | ||
| acp.c | ||
| acp.h | ||
| alsa-mixer.c | ||
| alsa-mixer.h | ||
| alsa-ucm.c | ||
| alsa-ucm.h | ||
| alsa-util.c | ||
| alsa-util.h | ||
| array.h | ||
| card.h | ||
| channelmap.h | ||
| compat.c | ||
| compat.h | ||
| conf-parser.c | ||
| conf-parser.h | ||
| device-port.h | ||
| dynarray.h | ||
| hashmap.h | ||
| idxset.h | ||
| llist.h | ||
| meson.build | ||
| proplist.h | ||
| test-alsa-path-select.c | ||
| volume.h | ||