Volume down key stops working with 3-channel (2.1) virtual sink (module-remap-sink)

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
c
Domain
desktop

Research direction

Start by tracing the volume-down handling around gvc_mixer_stream_get_volume and set_volume for module-remap-sink channels FL, FR, and LFE. Reproduce the issue with the listed PipeWire and WirePlumber setup, then verify that repeated volume-down keypresses continue changing all three channel levels instead of stopping when old_vol_pa equals new_vol_pa.

Written by the indexing model from the issue text.

Description

When using a virtual 2.1 sink created via module-remap-sink with channels FL,FR,LFE,
the volume down key stops working after a few presses.

gvc_mixer_stream_get_volume returns the max channel value, but after set_volume
the LFE channel drifts from FL/FR levels. On the next keypress old_vol_pa == new_vol_pa
so the condition if (old_vol_pa != new_vol_pa) is never true and volume doesn't change.

Volume UP works fine. Volume slider in Sound Settings works fine. Only volume DOWN key
is affected.

Setup: PipeWire 1.4.10, WirePlumber 0.5.13, Arch Linux, Realtek ALC897

Dominant language
C
Stars
71
Forks
75
No merged PRs in 30d

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